The typical high handicap or novice golfer will roll their club face open on the backswing. Their club face moves very low and inside on the backswing. By low and inside, I mean the club is behind them early and too flat as compared to their shoulder plane at address. This under the plane backswing will lead to a very steep downswing.
The club face is stabilized when the right handed player properly moves the left hand during the backswing.
An excellent drill for mastering club face stabilization is called the “Rockettes Drill” from Martin Chuck, PGA.
Learn how to properly assume the positions of this drill and even hit shots using this drill. Once you have mastered the drill you will better understand the fundamentals of the golf swing.