I don’t know if this answers your question. This is a 3d animation, so you could move the ball in the y direction if you wanted to. He only moves it in the x and z direction so you only have to think about those two, but it still needs a value. If it was a 2d animation then you would only have the two axises. I frequently forget that there are three axises to think about, since you only see it in 2d. You should set the y-axis to some other constant besides 0, or set it to a line a see what happens. Good luck, you are getting to the really fun stuff.
