When you learn to how to juggle 4 balls, it’s a bit different than juggling 3 balls. The reason is because the pattern is not a cascade. When you juggle 4 balls you are juggling 2 balls in each hand.
So the key here is that you learn how to juggle 2 balls in one hand comfortably first. Once you get that down all you have to do is learn how to do it at the same time.
How to Juggle 4 Balls Other Ways
The video above shows the typical pattern for juggling 4 balls. There are other ways to juggle 4 balls. One other method is the 4 ball shower. This is when you throw the balls in a circle pattern. It is much more difficult because you are not juggling 2 balls in each hand anymore.