Milo discusses fundamentals that start off every lesson, and every practice session. These include grip, posture and ball position.
Sergio is an example of the "Malaska Move." The club is shallow out of the top, but never under the plane.
The great dilemma for many players. Do you perfect the swing, or take the swing you have and perfect your game.
Old teaching taught forearm rotation. Modern teaching allows the wrists to release in the way they do for every other sport.