I don't know how they teach the game of tennis now. When I was trying to learn, we started out with racket and ball and the swings and serves.
I learned to hit the ball and play the game. But later, I realized I didn't have the motor fitness skills to do well at the game. I wish that I had done foot and whole body drills to help me switch direction quickly. Any number of times, I would trip over my own feet when changing direction.
I could have done more strength and flexibility exercises so I would have more control of my body - with a controlled bodily thrust.
Being able to balance my body and react with quickness on a return shot would have been great.
Oh well, I guess it's never too late to change my ways.