Godot

res:// are resources, stored in project's root dir

Read documentation of properties via ctrl + click.

Scenes are reusable components, so they can be used as nodes in other scenes. Instances produce independant objects from a blueprint.

Inputs are handled every frame via _process(), or _unhandled_input() which is called everytime player presses a key. Use this if you don't want to react on every frame.

Signals are messages that nodes emit when something specific happens to them, like a button being pressed.

Expose variables in the Godot Inspector by decorating them with the @export keyword.

References