When the clubface rotates the heel becomes the leading edge of the club and makes contact first so practice making dollar bill divots to eliminate that clubface rotation
Balance is key to rotating rather than bobbing in the golf swing
One of the most common faults in the swing is taking the club back outside, to fix this many players try to control the clubhead but in the swing it is actually the club handle that controls the clubhead so put a tee in your grip and measure your handle distance from your body through the swing