Start with How to make a Video Game - Godot Beginner Tutorial (77 min, Brackeys), then How to program in Godot - GDScript Tutorial (58 min, Brackeys). All 643 lessons here are free, from the teachers' own official uploads. You'll need game controller, laptop stand, noise-cancelling headphones (about $170 of kit). The book to keep beside you: The Art of Game Design by Jesse Schell.