You don't have to understand all the biomechanics of a golf swing in order to play well, but it certainly will help.
A person usually cannot pick up a golf club for the first time and swing it with perfection.
But, the body can learn the correct way to swing a golf club. One gotcha is to be sure to NOT lift your head to view the alignment of the club face during the back swing and/or downswing. The best focusing points for a consistent swing are:
1) efficient golf swing mechanics and
2) the body.
By keeping your joints supple and flexible, you could help ensure the length of your golf swing and even your club head speed.
Golf Swing Mechanics and Your Body
In order to learn efficient golf swing mechanics, the golf swing has to match your body's ability.