One of the most important moves in the golf swing is weight transfer. Not only is it a main source of power, but it also positions your body to strike the golf ball properly.
In the golf swing, it is critical to transfer your weight to the inner back leg on the backswing and then to the outer forward leg on the downswing. As all things in golf, it is easier said than done. Part of the reason for the difficulty is that the weight transfer is the result of a proper rotation or pivot around the body.
Here's a great video that explains how to transfer your weight correctly in your golf swing:
