Understanding how high to hit the ball can help your tennis game.
The only time you should hit the ball up at 12 feet is when you’re in trouble and you need to buy some time.
Your “normal” rally ball should be about 3 feet over the net.
When you need a little time or pop, hit the ball 6 feet over the net.
Try not to hit every ball 12 feet high. That makes for boring tennis. Try to limit yourself to 1 high ball per point.