One of the most common issues I see with beginners and also higher handicap players is proper lower body movement.
I believe the lower body movement is very similar to the motion of throwing a ball. Hogan described it as skipping a stone, or I would say throwing side arm. To many players either don’t use the lower body at all or they use it in reverse. They lean forward on the backswing then rock backwards on the forward swing.
In a proper weight shift the weight will load onto the trail leg on the backswing and move towards the lead leg on the forward swing.