Just download the Godot engine[0] it's free and there are lots of tutorials on Youtube.
The documentation[1] also has a tutorial that shows you how to create a small 2D and 3D game. To learn programming with gdscript there is this free course by gdquest.[2]
[0] https://godotengine.org/showcase/
[1] https://docs.godotengine.org/en/stable/getting_started/intro...