Hey! I honestly wanted to help you with your journey, but since I'm not a programmer anymore (I did join this jam last year, but don't worry about me) all I can tell you is to make a gameplay loop, trust me, make short games that last forever and focus on already existing concepts like flappy bird or subway surfers, you're gonna try to make an actual game and get overwhelmed and give up, you need to get used to game development before you tackle the big stuff. I hope this helps.
And by the way, this tip works with (almost) everything, that's (almost) what I'm doing to learn art 👍