Think of The platform You want to target with your ganes. Once You have decided, Start drawing a little something on The screen, any geometric figure Will do it. Try yo move your drawing on The screen using The keyboard or gamepad. Don't hesitate to use a Game engine like Godot if You feel The need, or a library like SDL2.
There are different kind of ganes You can implement, but they again, try to Start with small tasks.
While implementing your tasks. E.g playing a sound, You may want to revisiting some algorithms and some High school Math.
Most ganes follow The pattern of drawing, updating, check winning conditions. Game loop they Say, but don't into much theory at The beginning. Just have your ideas on The screen
Have fun!!!
I am unashamely sharing with You three little games I have coded [1]