Learn to take a divot in front of the ball by finding the three bottoms of your swing, fat shots are caused by using too much back arm and results in a swing bottom behind the ball
The position of the ball in your stance is determined by your swing shape and the club you are hitting. Your wedge should be near the center of your stance and your driver should be off your front heel.
Grip the club in your fingers, have your thumbs and index fingers pinched together to support the club at the top of your backswing and apply your grip pressure at a medium level