#Do you know any tutorials that explain the engine as a whole?
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This explains every basic aspect of the engine
https://docs.godotengine.org/en/stable/getting_started/step_by_step/index.html
Godot Engine documentation
This series builds upon the Introduction to Godot and will get you started with the editor and the engine. You will learn more about nodes and scenes, code your first classes with GDScript, use sig...
As a summary:
- Each scene contains any amount of nodes.
- Each node contains both a class and properties. (So, it is an object)
- The SceneTree, which holds all nodes present (and therefore holds a scene), makes calls to all nodes in an order from top to bottom (for general processing functions like _process() and _draw()) and from bottom to top (for input related functions, so the objects drawn above get priority)
- Nearly all node classes have virtual functions that you can override to take advantage of those calls. This is done by simply creating a function with the same name (all virtual functions start with an underscore)