What tipe of game do you want to make ? (3D, 2D, fps, point and click, platformer, puzzle game ... ) it can be influe what is the more important to learn in priority.
Also, what libreary/engine do you whant to use ? some engine have diferent aproche, or someone is spécialise for make one type of game.
I think a good way to leurn is watching tutorial video (becose you can see what type of game the personne make before watch the entire video).