A tricky but important concept to master is the golf swing plane; it is hard enough mastering the idea of one but three of them working in unison is mind-blowing. For a basic introduction to what it is, imagine the pendulum of a clock swinging freely. It forms a perfect arc, this is called a swing plane. To move the idea closer to golf imagine now holding a piece of string that is weighted and swing that, it also forms an arc, but using your wrist as a pivot point.
Now with golf it is a bit trickier to explain. We have the idea of the weight swinging freely, but what would happen if your arm or wrist were at an angle. Then the plane would be about that angle. If you arm was angled left, your plane would be angled left, if the arm was angled to the right then so would your plane. Move those thoughts to how you swing a golf club, the plane swing relates to when you swing the club around your body, and the two angled swings relate to the way you are tilting your body for the shot.
