Golf is a challenging sport because it requires you to move your body and golf club in coordination with one another. Getting your shoulders to move properly is a big part of moving your body properly. When you get your shoulders in the proper position, you'll find it much easier to swing the club properly.
Set up to the ball with your right shoulder slightly lower than the left, creating a slight tilt up in your shoulders.
Swing the club back and rotate your shoulders. As you rotate your shoulders, your left shoulder should rotate down slightly.
Rotate your shoulders 90 degrees to complete your backswing. Your left shoulder should be under your chin at the top of the backswing.
Start your downswing with your left shoulder moving toward the target and moving slightly upward. Rotate your shoulders back to the target as the club is coming down.
At impact, your right shoulder should be down and your left shoulder up. This position is similar to your setup position.
Continue to swing through and let your right shoulder go under your chin and rotate toward the target.
Finish your swing with your chest facing the target and your right shoulder slightly lower than the left.