Hi @iluvxion and welcome!
For me, the easiest way to learn how to make a game was to follow a tutorial. Below are two tutorials to get you started.
Tutorial of PlayCanvas:
https://developer.playcanvas.com/en/tutorials/keepyup-part-one
Tutorial of @commention:
https://forum.playcanvas.com/t/tutorial-create-a-simple-game-with-playcanvas