When playing I always try to hit the ball as hard as possible and often I find myself over hitting and therefore putting the ball out when going wide or long when trying to hit as close as I can to the opposite baseline.

Unhappy with this I set out to understand and correct this problem so after looking up the size of the court I found myself hitting as if I was on a football field which would explain why I made so many errors in conclusion adjusting to the length and width of the the court was very helpful in the long run.

Thought I would share what worked for me hope this helps.
Let me know.