I learn how to use unity input sistem an a lot of functions/methods of unity and list, I before use game maker
https://itch.io/jam/brackeys-5/rate/928211
Ohh, yeah, the input system is very important thing to learn.
Unity is very different from Gamemaker, but they both have their pros/cons.
As long as you get better with each gamejam, you should make bigger and better games!