Working on ball handling is something that every player should do regardless of position, especially with younger players. Because whether the player is a primary ball handler or not, it helps so much with their hands and being able to develop soft hands. This two ball dribbling drill is great for working on being able to strengthen both hands at the same time, making different moves with the basketball, and also working on staying in athletic position when you move with the ball.
This last one is important because a lot of players dribble the basketball standing too straight up, and this takes away from their ability to be as explosive as well protect the basketball from defenders. The box dribbling drill is great for really working on staying low and moving athletically with the ball.