Your forehand stance is WRONG (open vs closed) | Open, closed, semi, square....which stance are you suppose to use?! There are a lot of opinions and debates when it comes to tennis
Tennis Forehand Stances – Open vs Neutral Stance | Feel Tennis
Backhand Stance: Open Vs Closed - How to Play Tennis | Sikana
Open Stance vs Closed Stance Forehands (How To Know Which Tennis Footwork To Use) - YouTube