This tennis ball basketball dribbling drill is designed to help you work on your ball handling, hand eye coordination, and communication. These are all important things in the game of basketball, and whether you are a primary ball handler or a big man that just needs to work on their hands, this is a great basketball drill to use.
If you have never done a partner tennis ball toss drill before, then it may be challenging at first, but don't let it frustrate you. Keep working at the drill and you will become a better ball handler if you stick with it. The goal is to make you so comfortable dribbling the basketball that you don't have to think about it at all while you are playing in a game, and can focus on other things like reading the defense and running the offense.