I followed the tutorial for roll a ball to first implement the base game. I then found some online resources to help me figure out how to implement a basic jump (https://catlikecoding.com/unity/tutorials/movement/physics/). This resulted in me being able to jump an infinite amount of times. I then modified this so that I could only jump once, and not while I was in the air. I finally modified the jumping a second time to allow for double jumps.