The essence of a good golf swing is to 'Move Like and Athlete from One Spot'. It's the second part of that description that will enable you to put a consistent strike on the ball and maintain control of the club face. Everything we do has to revolve around a centred and balanced body position.
This is the basic concept of being able to maintain your body angles through the swing; a really key fundamental of playing the game. Much more information on how we turn and aspects to look out for can be found in the biomechanics section.