diff --git a/doc/demo01_hello/hello.md b/doc/demo01_hello/hello.md
index 382038a..fc328f4 100644
--- a/doc/demo01_hello/hello.md
+++ b/doc/demo01_hello/hello.md
@@ -29,6 +29,7 @@ ue虽然开源源代码，但是代码量太大，历史包袱太重，不适合
 
 ```
 使用godot你既可以用GDScript去编写代码，也可以用C++去编写代码，还可以去改底层引擎代码
+游戏行业到最后都是C++，如果想把游戏当作自己的事业，那绝对不要满足在脚本上，游戏最后的优化都是基于硬件显卡之上的，只能用C++
 ```
 
 - 用godot你能感觉我能把控底层，我能把控每一行代码的底层细节，这个是程序员的浪漫，godot在国外比较火是有原因的
@@ -41,4 +42,5 @@ ue虽然开源源代码，但是代码量太大，历史包袱太重，不适合
 - unity在很久之前也同时支持过js和C#，最后放弃了js，主要是因为unity是mono和C#非常友好
 - godot使用C++去解释执行gds，这个时候对于godot来说比较重，推荐gds
 - 通过学习gds也可以学到一些编译原理的知识
-- godot不仅仅是一个游戏引擎，而且还是一个优质的学习资源
\ No newline at end of file
+- godot不仅仅是一个游戏引擎，而且还是一个优质的学习资源
+- https://www.zhihu.com/question/393440831
diff --git a/doc/demo02_base/base.md b/doc/demo02_base/base.md
index 1ff9f47..e7f701e 100644
--- a/doc/demo02_base/base.md
+++ b/doc/demo02_base/base.md
@@ -1,17 +1,24 @@
 - 参考资料
 - [godot官方文档](https://docs.godotengine.org/en/stable/getting_started/scripting/gdscript/gdscript_basics.html)
-- [Godot Tutorials的youtube播放量最高的godot教程视频](https://www.youtube.com/watch?v=JJQa3xrRNM0&list=PLJ690cxlZTgL4i3sjTPRQTyrJ5TTkYJ2_)
+- [Godot Tutorials的GDScript Fundamentals Tutorial Series，youtube播放量最高的godot教程视频](https://www.youtube.com/watch?v=JJQa3xrRNM0&list=PLJ690cxlZTgL4i3sjTPRQTyrJ5TTkYJ2_)
+- [Godot Tutorials的Godot Basics Tutorial Series，youtube播放量最高的godot教程视频](https://www.youtube.com/watch?v=sChM51ibm5k&list=PLJ690cxlZTgIsmdEhFufnB7O6KWoMS8M6)
 - [B站视频](https://www.bilibili.com/video/BV17g4y1z7uS)
 
 # 数据类型
 - gds有5种基础类型
     - Boolean，Integer(Java long)，Float(Java double)，String，Null
 
-![Image text](integer.JPG)
-![Image text](integer_overflow.JPG)
-![Image text](gc.JPG)
-![Image text](step.JPG)
-
+![Image text](image/integer.JPG)
+![Image text](image/integer_overflow.JPG)
+![Image text](image/step.JPG)
+
+
+# 垃圾回收
+
+![Image text](image/gc.JPG)
+![Image text](image/gc1.png)
+![Image text](image/gc2.png)
+![Image text](image/gc3.png)
 
 
 
diff --git a/doc/demo02_base/gc.JPG b/doc/demo02_base/image/gc.JPG
similarity index 100%
rename from doc/demo02_base/gc.JPG
rename to doc/demo02_base/image/gc.JPG
diff --git a/doc/demo02_base/gc.JPG.import b/doc/demo02_base/image/gc.JPG.import
similarity index 71%
rename from doc/demo02_base/gc.JPG.import
rename to doc/demo02_base/image/gc.JPG.import
index 51836ab..7beedc0 100644
--- a/doc/demo02_base/gc.JPG.import
+++ b/doc/demo02_base/image/gc.JPG.import
@@ -2,15 +2,15 @@
 
 importer="texture"
 type="StreamTexture"
-path="res://.import/gc.JPG-39fa032320410100941ba40578241fc0.stex"
+path="res://.import/gc.JPG-7827fecfd1aba43aa0b40579830536b9.stex"
 metadata={
 "vram_texture": false
 }
 
 [deps]
 
-source_file="res://doc/demo02_base/gc.JPG"
-dest_files=[ "res://.import/gc.JPG-39fa032320410100941ba40578241fc0.stex" ]
+source_file="res://doc/demo02_base/image/gc.JPG"
+dest_files=[ "res://.import/gc.JPG-7827fecfd1aba43aa0b40579830536b9.stex" ]
 
 [params]
 
diff --git a/doc/demo02_base/image/gc1.png b/doc/demo02_base/image/gc1.png
new file mode 100644
index 0000000..4f2fc49
Binary files /dev/null and b/doc/demo02_base/image/gc1.png differ
diff --git a/doc/demo03_lifecycle/godot_node.jpg.import b/doc/demo02_base/image/gc1.png.import
similarity index 68%
rename from doc/demo03_lifecycle/godot_node.jpg.import
rename to doc/demo02_base/image/gc1.png.import
index e1e3432..1035a74 100644
--- a/doc/demo03_lifecycle/godot_node.jpg.import
+++ b/doc/demo02_base/image/gc1.png.import
@@ -2,15 +2,15 @@
 
 importer="texture"
 type="StreamTexture"
-path="res://.import/godot_node.jpg-16331f3f19dfee3528c1c8a0616ee82e.stex"
+path="res://.import/gc1.png-a39c555498c9b64c0ee3b8f21f2e4fb8.stex"
 metadata={
 "vram_texture": false
 }
 
 [deps]
 
-source_file="res://doc/demo03_lifecycle/godot_node.jpg"
-dest_files=[ "res://.import/godot_node.jpg-16331f3f19dfee3528c1c8a0616ee82e.stex" ]
+source_file="res://doc/demo02_base/image/gc1.png"
+dest_files=[ "res://.import/gc1.png-a39c555498c9b64c0ee3b8f21f2e4fb8.stex" ]
 
 [params]
 
diff --git a/doc/demo02_base/image/gc2.png b/doc/demo02_base/image/gc2.png
new file mode 100644
index 0000000..ca29363
Binary files /dev/null and b/doc/demo02_base/image/gc2.png differ
diff --git a/doc/demo02_base/image/gc2.png.import b/doc/demo02_base/image/gc2.png.import
new file mode 100644
index 0000000..ed8d271
--- /dev/null
+++ b/doc/demo02_base/image/gc2.png.import
@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="StreamTexture"
+path="res://.import/gc2.png-36e735a03a6ba26ca1d4686067190377.stex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://doc/demo02_base/image/gc2.png"
+dest_files=[ "res://.import/gc2.png-36e735a03a6ba26ca1d4686067190377.stex" ]
+
+[params]
+
+compress/mode=0
+compress/lossy_quality=0.7
+compress/hdr_mode=0
+compress/bptc_ldr=0
+compress/normal_map=0
+flags/repeat=0
+flags/filter=true
+flags/mipmaps=false
+flags/anisotropic=false
+flags/srgb=2
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/HDR_as_SRGB=false
+process/invert_color=false
+stream=false
+size_limit=0
+detect_3d=true
+svg/scale=1.0
diff --git a/doc/demo02_base/image/gc3.png b/doc/demo02_base/image/gc3.png
new file mode 100644
index 0000000..decc8cc
Binary files /dev/null and b/doc/demo02_base/image/gc3.png differ
diff --git a/doc/demo02_base/image/gc3.png.import b/doc/demo02_base/image/gc3.png.import
new file mode 100644
index 0000000..d5d9792
--- /dev/null
+++ b/doc/demo02_base/image/gc3.png.import
@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="StreamTexture"
+path="res://.import/gc3.png-46d3674dae65e7eced317eef68f37b06.stex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://doc/demo02_base/image/gc3.png"
+dest_files=[ "res://.import/gc3.png-46d3674dae65e7eced317eef68f37b06.stex" ]
+
+[params]
+
+compress/mode=0
+compress/lossy_quality=0.7
+compress/hdr_mode=0
+compress/bptc_ldr=0
+compress/normal_map=0
+flags/repeat=0
+flags/filter=true
+flags/mipmaps=false
+flags/anisotropic=false
+flags/srgb=2
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/HDR_as_SRGB=false
+process/invert_color=false
+stream=false
+size_limit=0
+detect_3d=true
+svg/scale=1.0
diff --git a/doc/demo02_base/integer.JPG b/doc/demo02_base/image/integer.JPG
similarity index 100%
rename from doc/demo02_base/integer.JPG
rename to doc/demo02_base/image/integer.JPG
diff --git a/doc/demo02_base/integer.JPG.import b/doc/demo02_base/image/integer.JPG.import
similarity index 70%
rename from doc/demo02_base/integer.JPG.import
rename to doc/demo02_base/image/integer.JPG.import
index 19da2a2..b1de16e 100644
--- a/doc/demo02_base/integer.JPG.import
+++ b/doc/demo02_base/image/integer.JPG.import
@@ -2,15 +2,15 @@
 
 importer="texture"
 type="StreamTexture"
-path="res://.import/integer.JPG-43a607bfd4c2c4f83e738b20fb6c9816.stex"
+path="res://.import/integer.JPG-d38f4d47a40d6571b935c32988bff48a.stex"
 metadata={
 "vram_texture": false
 }
 
 [deps]
 
-source_file="res://doc/demo02_base/integer.JPG"
-dest_files=[ "res://.import/integer.JPG-43a607bfd4c2c4f83e738b20fb6c9816.stex" ]
+source_file="res://doc/demo02_base/image/integer.JPG"
+dest_files=[ "res://.import/integer.JPG-d38f4d47a40d6571b935c32988bff48a.stex" ]
 
 [params]
 
diff --git a/doc/demo02_base/integer_overflow.JPG b/doc/demo02_base/image/integer_overflow.JPG
similarity index 100%
rename from doc/demo02_base/integer_overflow.JPG
rename to doc/demo02_base/image/integer_overflow.JPG
diff --git a/doc/demo02_base/image/integer_overflow.JPG.import b/doc/demo02_base/image/integer_overflow.JPG.import
new file mode 100644
index 0000000..e24927d
--- /dev/null
+++ b/doc/demo02_base/image/integer_overflow.JPG.import
@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="StreamTexture"
+path="res://.import/integer_overflow.JPG-88e55ff6d1e3a0fbf64a06739e111a58.stex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://doc/demo02_base/image/integer_overflow.JPG"
+dest_files=[ "res://.import/integer_overflow.JPG-88e55ff6d1e3a0fbf64a06739e111a58.stex" ]
+
+[params]
+
+compress/mode=0
+compress/lossy_quality=0.7
+compress/hdr_mode=0
+compress/bptc_ldr=0
+compress/normal_map=0
+flags/repeat=0
+flags/filter=true
+flags/mipmaps=false
+flags/anisotropic=false
+flags/srgb=2
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/HDR_as_SRGB=false
+process/invert_color=false
+stream=false
+size_limit=0
+detect_3d=true
+svg/scale=1.0
diff --git a/doc/demo02_base/step.JPG b/doc/demo02_base/image/step.JPG
similarity index 100%
rename from doc/demo02_base/step.JPG
rename to doc/demo02_base/image/step.JPG
diff --git a/doc/demo02_base/step.JPG.import b/doc/demo02_base/image/step.JPG.import
similarity index 70%
rename from doc/demo02_base/step.JPG.import
rename to doc/demo02_base/image/step.JPG.import
index 966474e..77bfa3a 100644
--- a/doc/demo02_base/step.JPG.import
+++ b/doc/demo02_base/image/step.JPG.import
@@ -2,15 +2,15 @@
 
 importer="texture"
 type="StreamTexture"
-path="res://.import/step.JPG-ea371ce51ca536d0350e70aed54f8432.stex"
+path="res://.import/step.JPG-3330779acd60e454bafa0c046c73413a.stex"
 metadata={
 "vram_texture": false
 }
 
 [deps]
 
-source_file="res://doc/demo02_base/step.JPG"
-dest_files=[ "res://.import/step.JPG-ea371ce51ca536d0350e70aed54f8432.stex" ]
+source_file="res://doc/demo02_base/image/step.JPG"
+dest_files=[ "res://.import/step.JPG-3330779acd60e454bafa0c046c73413a.stex" ]
 
 [params]
 
diff --git a/doc/demo03_lifecycle/image/delta-1.png b/doc/demo03_lifecycle/image/delta-1.png
new file mode 100644
index 0000000..5e27412
Binary files /dev/null and b/doc/demo03_lifecycle/image/delta-1.png differ
diff --git a/doc/demo03_lifecycle/image/delta-1.png.import b/doc/demo03_lifecycle/image/delta-1.png.import
new file mode 100644
index 0000000..68d44fc
--- /dev/null
+++ b/doc/demo03_lifecycle/image/delta-1.png.import
@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="StreamTexture"
+path="res://.import/delta-1.png-4590396c04276c6e10c1c3ad368b08e3.stex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://doc/demo03_lifecycle/image/delta-1.png"
+dest_files=[ "res://.import/delta-1.png-4590396c04276c6e10c1c3ad368b08e3.stex" ]
+
+[params]
+
+compress/mode=0
+compress/lossy_quality=0.7
+compress/hdr_mode=0
+compress/bptc_ldr=0
+compress/normal_map=0
+flags/repeat=0
+flags/filter=true
+flags/mipmaps=false
+flags/anisotropic=false
+flags/srgb=2
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/HDR_as_SRGB=false
+process/invert_color=false
+stream=false
+size_limit=0
+detect_3d=true
+svg/scale=1.0
diff --git a/doc/demo03_lifecycle/image/delta.png b/doc/demo03_lifecycle/image/delta.png
new file mode 100644
index 0000000..df19f97
Binary files /dev/null and b/doc/demo03_lifecycle/image/delta.png differ
diff --git a/doc/demo03_lifecycle/image/delta.png.import b/doc/demo03_lifecycle/image/delta.png.import
new file mode 100644
index 0000000..38192b5
--- /dev/null
+++ b/doc/demo03_lifecycle/image/delta.png.import
@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="StreamTexture"
+path="res://.import/delta.png-6d33a172cc16b58040616e8ab29659c0.stex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://doc/demo03_lifecycle/image/delta.png"
+dest_files=[ "res://.import/delta.png-6d33a172cc16b58040616e8ab29659c0.stex" ]
+
+[params]
+
+compress/mode=0
+compress/lossy_quality=0.7
+compress/hdr_mode=0
+compress/bptc_ldr=0
+compress/normal_map=0
+flags/repeat=0
+flags/filter=true
+flags/mipmaps=false
+flags/anisotropic=false
+flags/srgb=2
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/HDR_as_SRGB=false
+process/invert_color=false
+stream=false
+size_limit=0
+detect_3d=true
+svg/scale=1.0
diff --git a/doc/demo03_lifecycle/godot_lifecycle.jpg b/doc/demo03_lifecycle/image/godot_lifecycle.jpg
similarity index 100%
rename from doc/demo03_lifecycle/godot_lifecycle.jpg
rename to doc/demo03_lifecycle/image/godot_lifecycle.jpg
diff --git a/doc/demo03_lifecycle/godot_lifecycle.jpg.import b/doc/demo03_lifecycle/image/godot_lifecycle.jpg.import
similarity index 66%
rename from doc/demo03_lifecycle/godot_lifecycle.jpg.import
rename to doc/demo03_lifecycle/image/godot_lifecycle.jpg.import
index 67fca03..689c161 100644
--- a/doc/demo03_lifecycle/godot_lifecycle.jpg.import
+++ b/doc/demo03_lifecycle/image/godot_lifecycle.jpg.import
@@ -2,15 +2,15 @@
 
 importer="texture"
 type="StreamTexture"
-path="res://.import/godot_lifecycle.jpg-b26541e87e5327f35f02175dab2eb781.stex"
+path="res://.import/godot_lifecycle.jpg-037760a00ff142e71992244f6df72be8.stex"
 metadata={
 "vram_texture": false
 }
 
 [deps]
 
-source_file="res://doc/demo03_lifecycle/godot_lifecycle.jpg"
-dest_files=[ "res://.import/godot_lifecycle.jpg-b26541e87e5327f35f02175dab2eb781.stex" ]
+source_file="res://doc/demo03_lifecycle/image/godot_lifecycle.jpg"
+dest_files=[ "res://.import/godot_lifecycle.jpg-037760a00ff142e71992244f6df72be8.stex" ]
 
 [params]
 
diff --git a/doc/demo03_lifecycle/godot_node.jpg b/doc/demo03_lifecycle/image/godot_node.jpg
similarity index 100%
rename from doc/demo03_lifecycle/godot_node.jpg
rename to doc/demo03_lifecycle/image/godot_node.jpg
diff --git a/doc/demo03_lifecycle/image/godot_node.jpg.import b/doc/demo03_lifecycle/image/godot_node.jpg.import
new file mode 100644
index 0000000..78dd1c3
--- /dev/null
+++ b/doc/demo03_lifecycle/image/godot_node.jpg.import
@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="StreamTexture"
+path="res://.import/godot_node.jpg-b1ae50029be0ff59b37e5722166b013b.stex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://doc/demo03_lifecycle/image/godot_node.jpg"
+dest_files=[ "res://.import/godot_node.jpg-b1ae50029be0ff59b37e5722166b013b.stex" ]
+
+[params]
+
+compress/mode=0
+compress/lossy_quality=0.7
+compress/hdr_mode=0
+compress/bptc_ldr=0
+compress/normal_map=0
+flags/repeat=0
+flags/filter=true
+flags/mipmaps=false
+flags/anisotropic=false
+flags/srgb=2
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/HDR_as_SRGB=false
+process/invert_color=false
+stream=false
+size_limit=0
+detect_3d=true
+svg/scale=1.0
diff --git a/doc/demo03_lifecycle/godot_process.jpg b/doc/demo03_lifecycle/image/godot_process.jpg
similarity index 100%
rename from doc/demo03_lifecycle/godot_process.jpg
rename to doc/demo03_lifecycle/image/godot_process.jpg
diff --git a/doc/demo03_lifecycle/godot_process.jpg.import b/doc/demo03_lifecycle/image/godot_process.jpg.import
similarity index 67%
rename from doc/demo03_lifecycle/godot_process.jpg.import
rename to doc/demo03_lifecycle/image/godot_process.jpg.import
index 2dea079..7f487e4 100644
--- a/doc/demo03_lifecycle/godot_process.jpg.import
+++ b/doc/demo03_lifecycle/image/godot_process.jpg.import
@@ -2,15 +2,15 @@
 
 importer="texture"
 type="StreamTexture"
-path="res://.import/godot_process.jpg-0257d8dc365734710f5f2b2802378ee8.stex"
+path="res://.import/godot_process.jpg-2dfceb541e0df0a164b3b272e84ee08a.stex"
 metadata={
 "vram_texture": false
 }
 
 [deps]
 
-source_file="res://doc/demo03_lifecycle/godot_process.jpg"
-dest_files=[ "res://.import/godot_process.jpg-0257d8dc365734710f5f2b2802378ee8.stex" ]
+source_file="res://doc/demo03_lifecycle/image/godot_process.jpg"
+dest_files=[ "res://.import/godot_process.jpg-2dfceb541e0df0a164b3b272e84ee08a.stex" ]
 
 [params]
 
diff --git a/doc/demo03_lifecycle/image/physics-1.png b/doc/demo03_lifecycle/image/physics-1.png
new file mode 100644
index 0000000..5d3a62f
Binary files /dev/null and b/doc/demo03_lifecycle/image/physics-1.png differ
diff --git a/doc/demo03_lifecycle/image/physics-1.png.import b/doc/demo03_lifecycle/image/physics-1.png.import
new file mode 100644
index 0000000..e9bb5ef
--- /dev/null
+++ b/doc/demo03_lifecycle/image/physics-1.png.import
@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="StreamTexture"
+path="res://.import/physics-1.png-ef2e451962ac74f3691ab95a9cac88aa.stex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://doc/demo03_lifecycle/image/physics-1.png"
+dest_files=[ "res://.import/physics-1.png-ef2e451962ac74f3691ab95a9cac88aa.stex" ]
+
+[params]
+
+compress/mode=0
+compress/lossy_quality=0.7
+compress/hdr_mode=0
+compress/bptc_ldr=0
+compress/normal_map=0
+flags/repeat=0
+flags/filter=true
+flags/mipmaps=false
+flags/anisotropic=false
+flags/srgb=2
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/HDR_as_SRGB=false
+process/invert_color=false
+stream=false
+size_limit=0
+detect_3d=true
+svg/scale=1.0
diff --git a/doc/demo03_lifecycle/image/physics.png b/doc/demo03_lifecycle/image/physics.png
new file mode 100644
index 0000000..5416f5c
Binary files /dev/null and b/doc/demo03_lifecycle/image/physics.png differ
diff --git a/doc/demo03_lifecycle/image/physics.png.import b/doc/demo03_lifecycle/image/physics.png.import
new file mode 100644
index 0000000..d0cde67
--- /dev/null
+++ b/doc/demo03_lifecycle/image/physics.png.import
@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="StreamTexture"
+path="res://.import/physics.png-9f49b72ca846193cb574ebd2739c5037.stex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://doc/demo03_lifecycle/image/physics.png"
+dest_files=[ "res://.import/physics.png-9f49b72ca846193cb574ebd2739c5037.stex" ]
+
+[params]
+
+compress/mode=0
+compress/lossy_quality=0.7
+compress/hdr_mode=0
+compress/bptc_ldr=0
+compress/normal_map=0
+flags/repeat=0
+flags/filter=true
+flags/mipmaps=false
+flags/anisotropic=false
+flags/srgb=2
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/HDR_as_SRGB=false
+process/invert_color=false
+stream=false
+size_limit=0
+detect_3d=true
+svg/scale=1.0
diff --git a/doc/demo03_lifecycle/image/process-1.png b/doc/demo03_lifecycle/image/process-1.png
new file mode 100644
index 0000000..ff76df3
Binary files /dev/null and b/doc/demo03_lifecycle/image/process-1.png differ
diff --git a/doc/demo03_lifecycle/image/process-1.png.import b/doc/demo03_lifecycle/image/process-1.png.import
new file mode 100644
index 0000000..24b0d90
--- /dev/null
+++ b/doc/demo03_lifecycle/image/process-1.png.import
@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="StreamTexture"
+path="res://.import/process-1.png-02e8fff5bdf8b34a093c5dac67d08419.stex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://doc/demo03_lifecycle/image/process-1.png"
+dest_files=[ "res://.import/process-1.png-02e8fff5bdf8b34a093c5dac67d08419.stex" ]
+
+[params]
+
+compress/mode=0
+compress/lossy_quality=0.7
+compress/hdr_mode=0
+compress/bptc_ldr=0
+compress/normal_map=0
+flags/repeat=0
+flags/filter=true
+flags/mipmaps=false
+flags/anisotropic=false
+flags/srgb=2
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/HDR_as_SRGB=false
+process/invert_color=false
+stream=false
+size_limit=0
+detect_3d=true
+svg/scale=1.0
diff --git a/doc/demo03_lifecycle/image/process.png b/doc/demo03_lifecycle/image/process.png
new file mode 100644
index 0000000..5ce2730
Binary files /dev/null and b/doc/demo03_lifecycle/image/process.png differ
diff --git a/doc/demo03_lifecycle/image/process.png.import b/doc/demo03_lifecycle/image/process.png.import
new file mode 100644
index 0000000..deb639d
--- /dev/null
+++ b/doc/demo03_lifecycle/image/process.png.import
@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="StreamTexture"
+path="res://.import/process.png-05cef36425ae9b8cc0b114b51584db1c.stex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://doc/demo03_lifecycle/image/process.png"
+dest_files=[ "res://.import/process.png-05cef36425ae9b8cc0b114b51584db1c.stex" ]
+
+[params]
+
+compress/mode=0
+compress/lossy_quality=0.7
+compress/hdr_mode=0
+compress/bptc_ldr=0
+compress/normal_map=0
+flags/repeat=0
+flags/filter=true
+flags/mipmaps=false
+flags/anisotropic=false
+flags/srgb=2
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/HDR_as_SRGB=false
+process/invert_color=false
+stream=false
+size_limit=0
+detect_3d=true
+svg/scale=1.0
diff --git a/doc/demo03_lifecycle/image/场景帧.png b/doc/demo03_lifecycle/image/场景帧.png
new file mode 100644
index 0000000..6041dfe
Binary files /dev/null and b/doc/demo03_lifecycle/image/场景帧.png differ
diff --git a/doc/demo03_lifecycle/image/场景帧.png.import b/doc/demo03_lifecycle/image/场景帧.png.import
new file mode 100644
index 0000000..d57213a
--- /dev/null
+++ b/doc/demo03_lifecycle/image/场景帧.png.import
@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="StreamTexture"
+path="res://.import/场景帧.png-d58f7565689f65bb808fb434138afafb.stex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://doc/demo03_lifecycle/image/场景帧.png"
+dest_files=[ "res://.import/场景帧.png-d58f7565689f65bb808fb434138afafb.stex" ]
+
+[params]
+
+compress/mode=0
+compress/lossy_quality=0.7
+compress/hdr_mode=0
+compress/bptc_ldr=0
+compress/normal_map=0
+flags/repeat=0
+flags/filter=true
+flags/mipmaps=false
+flags/anisotropic=false
+flags/srgb=2
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/HDR_as_SRGB=false
+process/invert_color=false
+stream=false
+size_limit=0
+detect_3d=true
+svg/scale=1.0
diff --git a/doc/demo03_lifecycle/image/场景循环.png b/doc/demo03_lifecycle/image/场景循环.png
new file mode 100644
index 0000000..b089c2c
Binary files /dev/null and b/doc/demo03_lifecycle/image/场景循环.png differ
diff --git a/doc/demo03_lifecycle/image/场景循环.png.import b/doc/demo03_lifecycle/image/场景循环.png.import
new file mode 100644
index 0000000..968cde9
--- /dev/null
+++ b/doc/demo03_lifecycle/image/场景循环.png.import
@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="StreamTexture"
+path="res://.import/场景循环.png-f6713b039d478efc4a04732969cd2801.stex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://doc/demo03_lifecycle/image/场景循环.png"
+dest_files=[ "res://.import/场景循环.png-f6713b039d478efc4a04732969cd2801.stex" ]
+
+[params]
+
+compress/mode=0
+compress/lossy_quality=0.7
+compress/hdr_mode=0
+compress/bptc_ldr=0
+compress/normal_map=0
+flags/repeat=0
+flags/filter=true
+flags/mipmaps=false
+flags/anisotropic=false
+flags/srgb=2
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/HDR_as_SRGB=false
+process/invert_color=false
+stream=false
+size_limit=0
+detect_3d=true
+svg/scale=1.0
diff --git a/doc/demo03_lifecycle/lifecycle.md b/doc/demo03_lifecycle/lifecycle.md
index c73ece4..627c902 100644
--- a/doc/demo03_lifecycle/lifecycle.md
+++ b/doc/demo03_lifecycle/lifecycle.md
@@ -1,3 +1,13 @@
-![Image text](./godot_process.jpg)
-![Image text](./godot_node.jpg)
-![Image text](./godot_lifecycle.jpg)
+![Image text](image/场景循环.png)
+![Image text](image/场景帧.png)
+![Image text](image/delta.png)
+![Image text](image/delta-1.png)
+![Image text](image/godot_process.jpg)
+![Image text](image/godot_node.jpg)
+![Image text](image/godot_lifecycle.jpg)
+
+
+![Image text](image/process.png)
+![Image text](image/process-1.png)
+![Image text](image/physics.png)
+![Image text](image/physics-1.png)
diff --git a/doc/demo05_scene_node/image/component1.png b/doc/demo05_scene_node/image/component1.png
new file mode 100644
index 0000000..892739d
Binary files /dev/null and b/doc/demo05_scene_node/image/component1.png differ
diff --git a/doc/demo05_scene_node/image/component1.png.import b/doc/demo05_scene_node/image/component1.png.import
new file mode 100644
index 0000000..be8994c
--- /dev/null
+++ b/doc/demo05_scene_node/image/component1.png.import
@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="StreamTexture"
+path="res://.import/component1.png-bfffd673f61ca5b7b9409dbd5abb1acc.stex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://doc/demo05_scene_node/image/component1.png"
+dest_files=[ "res://.import/component1.png-bfffd673f61ca5b7b9409dbd5abb1acc.stex" ]
+
+[params]
+
+compress/mode=0
+compress/lossy_quality=0.7
+compress/hdr_mode=0
+compress/bptc_ldr=0
+compress/normal_map=0
+flags/repeat=0
+flags/filter=true
+flags/mipmaps=false
+flags/anisotropic=false
+flags/srgb=2
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/HDR_as_SRGB=false
+process/invert_color=false
+stream=false
+size_limit=0
+detect_3d=true
+svg/scale=1.0
diff --git a/doc/demo05_scene_node/image/component2.png b/doc/demo05_scene_node/image/component2.png
new file mode 100644
index 0000000..6fc1207
Binary files /dev/null and b/doc/demo05_scene_node/image/component2.png differ
diff --git a/doc/demo05_scene_node/image/component2.png.import b/doc/demo05_scene_node/image/component2.png.import
new file mode 100644
index 0000000..976fae3
--- /dev/null
+++ b/doc/demo05_scene_node/image/component2.png.import
@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="StreamTexture"
+path="res://.import/component2.png-02438ddc3566bd64199cba25f509171f.stex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://doc/demo05_scene_node/image/component2.png"
+dest_files=[ "res://.import/component2.png-02438ddc3566bd64199cba25f509171f.stex" ]
+
+[params]
+
+compress/mode=0
+compress/lossy_quality=0.7
+compress/hdr_mode=0
+compress/bptc_ldr=0
+compress/normal_map=0
+flags/repeat=0
+flags/filter=true
+flags/mipmaps=false
+flags/anisotropic=false
+flags/srgb=2
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/HDR_as_SRGB=false
+process/invert_color=false
+stream=false
+size_limit=0
+detect_3d=true
+svg/scale=1.0
diff --git a/doc/demo05_scene_node/image/component3.png b/doc/demo05_scene_node/image/component3.png
new file mode 100644
index 0000000..562bcfa
Binary files /dev/null and b/doc/demo05_scene_node/image/component3.png differ
diff --git a/doc/demo05_scene_node/image/component3.png.import b/doc/demo05_scene_node/image/component3.png.import
new file mode 100644
index 0000000..aeeb5ed
--- /dev/null
+++ b/doc/demo05_scene_node/image/component3.png.import
@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="StreamTexture"
+path="res://.import/component3.png-e2e3aef9bbb5a8e0d59937c323e75c96.stex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://doc/demo05_scene_node/image/component3.png"
+dest_files=[ "res://.import/component3.png-e2e3aef9bbb5a8e0d59937c323e75c96.stex" ]
+
+[params]
+
+compress/mode=0
+compress/lossy_quality=0.7
+compress/hdr_mode=0
+compress/bptc_ldr=0
+compress/normal_map=0
+flags/repeat=0
+flags/filter=true
+flags/mipmaps=false
+flags/anisotropic=false
+flags/srgb=2
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/HDR_as_SRGB=false
+process/invert_color=false
+stream=false
+size_limit=0
+detect_3d=true
+svg/scale=1.0
diff --git a/doc/demo05_scene_node/image/component4.png b/doc/demo05_scene_node/image/component4.png
new file mode 100644
index 0000000..ed7e8fe
Binary files /dev/null and b/doc/demo05_scene_node/image/component4.png differ
diff --git a/doc/demo05_scene_node/image/component4.png.import b/doc/demo05_scene_node/image/component4.png.import
new file mode 100644
index 0000000..0f47d94
--- /dev/null
+++ b/doc/demo05_scene_node/image/component4.png.import
@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="StreamTexture"
+path="res://.import/component4.png-bcbe335fca7b1a1e0ff653b967054cf0.stex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://doc/demo05_scene_node/image/component4.png"
+dest_files=[ "res://.import/component4.png-bcbe335fca7b1a1e0ff653b967054cf0.stex" ]
+
+[params]
+
+compress/mode=0
+compress/lossy_quality=0.7
+compress/hdr_mode=0
+compress/bptc_ldr=0
+compress/normal_map=0
+flags/repeat=0
+flags/filter=true
+flags/mipmaps=false
+flags/anisotropic=false
+flags/srgb=2
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/HDR_as_SRGB=false
+process/invert_color=false
+stream=false
+size_limit=0
+detect_3d=true
+svg/scale=1.0
diff --git a/doc/demo05_scene_node/image/component5.png b/doc/demo05_scene_node/image/component5.png
new file mode 100644
index 0000000..6bd2443
Binary files /dev/null and b/doc/demo05_scene_node/image/component5.png differ
diff --git a/doc/demo05_scene_node/image/component5.png.import b/doc/demo05_scene_node/image/component5.png.import
new file mode 100644
index 0000000..7bc9917
--- /dev/null
+++ b/doc/demo05_scene_node/image/component5.png.import
@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="StreamTexture"
+path="res://.import/component5.png-e232bac21600f8aad9b90d6e61d0869d.stex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://doc/demo05_scene_node/image/component5.png"
+dest_files=[ "res://.import/component5.png-e232bac21600f8aad9b90d6e61d0869d.stex" ]
+
+[params]
+
+compress/mode=0
+compress/lossy_quality=0.7
+compress/hdr_mode=0
+compress/bptc_ldr=0
+compress/normal_map=0
+flags/repeat=0
+flags/filter=true
+flags/mipmaps=false
+flags/anisotropic=false
+flags/srgb=2
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/HDR_as_SRGB=false
+process/invert_color=false
+stream=false
+size_limit=0
+detect_3d=true
+svg/scale=1.0
diff --git a/doc/demo05_scene_node/image/场景.png b/doc/demo05_scene_node/image/场景.png
new file mode 100644
index 0000000..290c059
Binary files /dev/null and b/doc/demo05_scene_node/image/场景.png differ
diff --git a/doc/demo05_scene_node/image/场景.png.import b/doc/demo05_scene_node/image/场景.png.import
new file mode 100644
index 0000000..e5afd9c
--- /dev/null
+++ b/doc/demo05_scene_node/image/场景.png.import
@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="StreamTexture"
+path="res://.import/场景.png-7f14201406e86b2c1d0ba5c1fb89a726.stex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://doc/demo05_scene_node/image/场景.png"
+dest_files=[ "res://.import/场景.png-7f14201406e86b2c1d0ba5c1fb89a726.stex" ]
+
+[params]
+
+compress/mode=0
+compress/lossy_quality=0.7
+compress/hdr_mode=0
+compress/bptc_ldr=0
+compress/normal_map=0
+flags/repeat=0
+flags/filter=true
+flags/mipmaps=false
+flags/anisotropic=false
+flags/srgb=2
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/HDR_as_SRGB=false
+process/invert_color=false
+stream=false
+size_limit=0
+detect_3d=true
+svg/scale=1.0
diff --git a/doc/demo05_scene_node/image/坐标系-godot-1.png b/doc/demo05_scene_node/image/坐标系-godot-1.png
new file mode 100644
index 0000000..b57f92f
Binary files /dev/null and b/doc/demo05_scene_node/image/坐标系-godot-1.png differ
diff --git a/doc/demo05_scene_node/image/坐标系-godot-1.png.import b/doc/demo05_scene_node/image/坐标系-godot-1.png.import
new file mode 100644
index 0000000..d145cd8
--- /dev/null
+++ b/doc/demo05_scene_node/image/坐标系-godot-1.png.import
@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="StreamTexture"
+path="res://.import/坐标系-godot-1.png-b9dfb88e50a51646aec5b1bca8dd901b.stex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://doc/demo05_scene_node/image/坐标系-godot-1.png"
+dest_files=[ "res://.import/坐标系-godot-1.png-b9dfb88e50a51646aec5b1bca8dd901b.stex" ]
+
+[params]
+
+compress/mode=0
+compress/lossy_quality=0.7
+compress/hdr_mode=0
+compress/bptc_ldr=0
+compress/normal_map=0
+flags/repeat=0
+flags/filter=true
+flags/mipmaps=false
+flags/anisotropic=false
+flags/srgb=2
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/HDR_as_SRGB=false
+process/invert_color=false
+stream=false
+size_limit=0
+detect_3d=true
+svg/scale=1.0
diff --git a/doc/demo05_scene_node/image/坐标系-godot-4个象限.png b/doc/demo05_scene_node/image/坐标系-godot-4个象限.png
new file mode 100644
index 0000000..479398c
Binary files /dev/null and b/doc/demo05_scene_node/image/坐标系-godot-4个象限.png differ
diff --git a/doc/demo05_scene_node/image/坐标系-godot-4个象限.png.import b/doc/demo05_scene_node/image/坐标系-godot-4个象限.png.import
new file mode 100644
index 0000000..df66613
--- /dev/null
+++ b/doc/demo05_scene_node/image/坐标系-godot-4个象限.png.import
@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="StreamTexture"
+path="res://.import/坐标系-godot-4个象限.png-47092e2d3ef1fb607296ce2a91696203.stex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://doc/demo05_scene_node/image/坐标系-godot-4个象限.png"
+dest_files=[ "res://.import/坐标系-godot-4个象限.png-47092e2d3ef1fb607296ce2a91696203.stex" ]
+
+[params]
+
+compress/mode=0
+compress/lossy_quality=0.7
+compress/hdr_mode=0
+compress/bptc_ldr=0
+compress/normal_map=0
+flags/repeat=0
+flags/filter=true
+flags/mipmaps=false
+flags/anisotropic=false
+flags/srgb=2
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/HDR_as_SRGB=false
+process/invert_color=false
+stream=false
+size_limit=0
+detect_3d=true
+svg/scale=1.0
diff --git a/doc/demo05_scene_node/image/坐标系-ps.JPG b/doc/demo05_scene_node/image/坐标系-ps.JPG
new file mode 100644
index 0000000..035ed63
Binary files /dev/null and b/doc/demo05_scene_node/image/坐标系-ps.JPG differ
diff --git a/doc/demo02_base/integer_overflow.JPG.import b/doc/demo05_scene_node/image/坐标系-ps.JPG.import
similarity index 67%
rename from doc/demo02_base/integer_overflow.JPG.import
rename to doc/demo05_scene_node/image/坐标系-ps.JPG.import
index 940e120..c306eef 100644
--- a/doc/demo02_base/integer_overflow.JPG.import
+++ b/doc/demo05_scene_node/image/坐标系-ps.JPG.import
@@ -2,15 +2,15 @@
 
 importer="texture"
 type="StreamTexture"
-path="res://.import/integer_overflow.JPG-08e89d4444868183c3be1155d3451030.stex"
+path="res://.import/坐标系-ps.JPG-e90c99294ebd56598afae2b5db793ff2.stex"
 metadata={
 "vram_texture": false
 }
 
 [deps]
 
-source_file="res://doc/demo02_base/integer_overflow.JPG"
-dest_files=[ "res://.import/integer_overflow.JPG-08e89d4444868183c3be1155d3451030.stex" ]
+source_file="res://doc/demo05_scene_node/image/坐标系-ps.JPG"
+dest_files=[ "res://.import/坐标系-ps.JPG-e90c99294ebd56598afae2b5db793ff2.stex" ]
 
 [params]
 
diff --git a/doc/demo05_scene_node/image/坐标系.png b/doc/demo05_scene_node/image/坐标系.png
new file mode 100644
index 0000000..05eb214
Binary files /dev/null and b/doc/demo05_scene_node/image/坐标系.png differ
diff --git a/doc/demo05_scene_node/image/坐标系.png.import b/doc/demo05_scene_node/image/坐标系.png.import
new file mode 100644
index 0000000..1ebb5aa
--- /dev/null
+++ b/doc/demo05_scene_node/image/坐标系.png.import
@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="StreamTexture"
+path="res://.import/坐标系.png-8f9d049adb143c879b7a19c22253ff65.stex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://doc/demo05_scene_node/image/坐标系.png"
+dest_files=[ "res://.import/坐标系.png-8f9d049adb143c879b7a19c22253ff65.stex" ]
+
+[params]
+
+compress/mode=0
+compress/lossy_quality=0.7
+compress/hdr_mode=0
+compress/bptc_ldr=0
+compress/normal_map=0
+flags/repeat=0
+flags/filter=true
+flags/mipmaps=false
+flags/anisotropic=false
+flags/srgb=2
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/HDR_as_SRGB=false
+process/invert_color=false
+stream=false
+size_limit=0
+detect_3d=true
+svg/scale=1.0
diff --git a/doc/demo05_scene_node/image/节点.png b/doc/demo05_scene_node/image/节点.png
new file mode 100644
index 0000000..8402a7e
Binary files /dev/null and b/doc/demo05_scene_node/image/节点.png differ
diff --git a/doc/demo05_scene_node/image/节点.png.import b/doc/demo05_scene_node/image/节点.png.import
new file mode 100644
index 0000000..2a9d124
--- /dev/null
+++ b/doc/demo05_scene_node/image/节点.png.import
@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="StreamTexture"
+path="res://.import/节点.png-caccd57bbbfafdce9e2636439f7a3f30.stex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://doc/demo05_scene_node/image/节点.png"
+dest_files=[ "res://.import/节点.png-caccd57bbbfafdce9e2636439f7a3f30.stex" ]
+
+[params]
+
+compress/mode=0
+compress/lossy_quality=0.7
+compress/hdr_mode=0
+compress/bptc_ldr=0
+compress/normal_map=0
+flags/repeat=0
+flags/filter=true
+flags/mipmaps=false
+flags/anisotropic=false
+flags/srgb=2
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/HDR_as_SRGB=false
+process/invert_color=false
+stream=false
+size_limit=0
+detect_3d=true
+svg/scale=1.0
diff --git a/doc/demo05_scene_node/image/节点渲染顺序.png b/doc/demo05_scene_node/image/节点渲染顺序.png
new file mode 100644
index 0000000..e3cd7c2
Binary files /dev/null and b/doc/demo05_scene_node/image/节点渲染顺序.png differ
diff --git a/doc/demo05_scene_node/image/节点渲染顺序.png.import b/doc/demo05_scene_node/image/节点渲染顺序.png.import
new file mode 100644
index 0000000..9a4c45e
--- /dev/null
+++ b/doc/demo05_scene_node/image/节点渲染顺序.png.import
@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="StreamTexture"
+path="res://.import/节点渲染顺序.png-399ad5898925e3419def2ff658ef0991.stex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://doc/demo05_scene_node/image/节点渲染顺序.png"
+dest_files=[ "res://.import/节点渲染顺序.png-399ad5898925e3419def2ff658ef0991.stex" ]
+
+[params]
+
+compress/mode=0
+compress/lossy_quality=0.7
+compress/hdr_mode=0
+compress/bptc_ldr=0
+compress/normal_map=0
+flags/repeat=0
+flags/filter=true
+flags/mipmaps=false
+flags/anisotropic=false
+flags/srgb=2
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/HDR_as_SRGB=false
+process/invert_color=false
+stream=false
+size_limit=0
+detect_3d=true
+svg/scale=1.0
diff --git a/doc/demo05_scene_node/scene_node.md b/doc/demo05_scene_node/scene_node.md
new file mode 100644
index 0000000..3e5b4af
--- /dev/null
+++ b/doc/demo05_scene_node/scene_node.md
@@ -0,0 +1,34 @@
+# 坐标系
+
+![Image text](image/坐标系.png)
+![Image text](image/坐标系-godot-1.png)
+![Image text](image/坐标系-godot-4个象限.png)
+![Image text](image/坐标系-ps.JPG)
+
+```
+因为刚开始的时候有点疑惑，godot的坐标系，原点既然在左上角。unity，cocos的2d原点都在左下角，左下角的2d坐标系感觉很复合习惯。
+unity的坐标系就很符合数学里面的象限，刚开始有点不适应。
+
+后来了解到，计算机屏幕是从左上角开始刷新的，2d坐标系左上角为原点可以屏幕坐标系吻合可以提升一点效率。  
+
+unity的2d坐标系虽然在左下角，但是unity的屏幕坐标系依然在左上角，不统一。
+虽然godot的2d坐标系在左上角的坐标系刚开始看不舒服，但是和屏幕坐标系吻合了，也算一种统一，就不需要untiy2d的那么多概念了，为godot点赞。
+
+因为单论平面内容制作，左上原点更符合视觉习惯，也更符合设计常识，比如ps。
+```
+
+# 场景和节点
+
+![Image text](image/场景.png  )
+![Image text](image/节点.png)
+![Image text](image/节点渲染顺序.png)
+- 一个游戏可以包含多个场景，但是一个场景中必须有一个根节点，一个根节点可以包含多个不重名的子节点（unity的子节点可以同名），不同名更加符合习惯，为godot点赞。
+
+
+# 基本组件
+
+![Image text](./image/component1.png)
+![Image text](./image/component2.png)
+![Image text](./image/component3.png)
+![Image text](./image/component4.png)
+![Image text](./image/component5.png)
diff --git a/scene/demo05_scene_node/SceneNode.tscn b/scene/demo05_scene_node/SceneNode.tscn
new file mode 100644
index 0000000..674eab3
--- /dev/null
+++ b/scene/demo05_scene_node/SceneNode.tscn
@@ -0,0 +1,11 @@
+[gd_scene load_steps=3 format=2]
+
+[ext_resource path="res://script/demo06_scene_node/hero.gd" type="Script" id=1]
+[ext_resource path="res://icon.png" type="Texture" id=2]
+
+[node name="Node2D" type="Node2D"]
+
+[node name="Hero" type="Sprite" parent="."]
+position = Vector2( 477.791, 270.893 )
+texture = ExtResource( 2 )
+script = ExtResource( 1 )
diff --git a/scene/demo_test/DemoTest.tscn b/scene/demo_test/DemoTest.tscn
index f882b8a..c5fedd6 100644
--- a/scene/demo_test/DemoTest.tscn
+++ b/scene/demo_test/DemoTest.tscn
@@ -1,6 +1,11 @@
-[gd_scene load_steps=2 format=2]
+[gd_scene load_steps=3 format=2]
 
 [ext_resource path="res://script/demo_test/demoTest.gd" type="Script" id=1]
+[ext_resource path="res://icon.png" type="Texture" id=2]
 
 [node name="Node2D" type="Node2D"]
 script = ExtResource( 1 )
+
+[node name="icon" type="Sprite" parent="."]
+position = Vector2( 410.547, 444.333 )
+texture = ExtResource( 2 )
diff --git a/script/demo02_base/base.gd b/script/demo02_base/base.gd
index b174f89..6af820a 100644
--- a/script/demo02_base/base.gd
+++ b/script/demo02_base/base.gd
@@ -37,7 +37,7 @@ func _ready():
 	myClass.innerClassTest()
 
 	print("垃圾回收--------------------------------")
-	# 如果一个类没有指明继承哪个类，则默认继承Reference（可以被自动的垃圾回收，类似其他语言的那种垃圾回收）
+	# 如果一个类没有指明继承哪个类，则默认继承Reference（可以被自动的垃圾回收，类似其他语言的那种垃圾回收），非常重要的知识点
 	for i in range(10000):
 		var instance = MyClass.new()
 		arr.append(instance)
diff --git a/script/demo06_scene_node/hero.gd b/script/demo06_scene_node/hero.gd
new file mode 100644
index 0000000..f1e40ae
--- /dev/null
+++ b/script/demo06_scene_node/hero.gd
@@ -0,0 +1,36 @@
+extends Sprite
+
+
+var gameWidth: int
+var gameHeight: int
+var spriteWidth: int
+var spriteHeight: int
+	
+func _physics_process(delta):
+	setupSprite()
+	setupGameWindow()	
+	positionTopCenter()
+
+func setupSprite():
+	spriteWidth = texture.get_width()
+	spriteHeight = texture.get_height()
+
+func setupGameWindow():
+	gameWidth = OS.window_size.x
+	gameHeight = OS.window_size.y
+	
+func positionTopCenter() -> void:
+	self.position.x = gameWidth / 2
+	self.position.y = spriteHeight / 2
+
+func positionCenter() -> void:
+	self.position.x = gameWidth / 2
+	self.position.y = gameHeight / 2
+
+func positionBottomCenter() -> void:
+	self.position.x = gameWidth / 2
+	self.position.y = gameHeight - spriteHeight / 2
+
+func positionLeftCenter() -> void:
+	self.position.x = spriteWidth / 2
+	self.position.y = gameHeight / 2
diff --git a/util/RandomUtils.gd b/util/RandomUtils.gd
index 612a828..05ba0ee 100644
--- a/util/RandomUtils.gd
+++ b/util/RandomUtils.gd
@@ -38,3 +38,6 @@ static func randomIntRange(from: int, to: int) -> int:
 		return 0
 	
 	return getRandom().randi_range(from, to - 1)
+
+static func randomEle(array: Array):
+	return array[randomIntLimit(array.size())]