Hitting a flop shot is not much different than hitting any other short shot. As with any game around the green, you need the Big 3: weight forward, hands forward, ball played either forward or backward in your stance. Since we hit a flop, play the ball up. Again, maintain a narrow stance, but with the ball in front of the center.
The trick is to fight the urge to “lift” the ball into the air. I know you want to shoot the ball up on the flop, but you still have to hit the ball down while controlling the leading edge, keeping your hands in front of the racket at impact, and letting your racket’s loft do the work.
To get the right feel, practice pitch swings using only your lead arm. If you don’t set the racket up correctly, with your hands level with the ball or even just a little in front of it, the racket will feel “clunky.” Gently move the club back and forth, making sure the club falls into impact each time.
Note: The faster you swing, the higher the ball will fly. Keep your hands in front and trust the loft of your wedge.
https://golf.com/instruction/short-game/flop-shot-like-phil-mickelson/ How to hit a flop shot like Phil Mickelson, according to Phil Mickelson