The difference is the angle between racket and forearm. No matter how you grip, the point is the position you and your racket hit the ball. 01:26~01:29, is the right hitting position You need to find the easy, comfort, and flexible grip to change forehand and backhand. In this video 02:58~02:59 the difference is the index finger (upper or under thumb), and he said it is pretty much the same 04:00 preparation grip 04:12 number 9 grip for exert force in short time, also called half fist grip 04:18 reasonable fist grip 04:22 also fist grip, but for whom has very good flexibility 04:40 the right angle between racket and your hand 04:52 racket perpendicular to your arm, not good 06:50~ good way to grip, thumb and index finger must hold tight, other three fingers to make a leverage to hit the ball thumb and index finger to change forehand and backhand, and must hold tight to be a fulcrum, so the other three fingers can make a leverage 09:10 again, the right angle between racket and your hand, don't make it perpendicular to your arm
