There are two prominent lines of thought in golf swing theory. One is that you swing the clubhead. The other is that you swing the handle. But what you really want to do is swing the whole club, not just part of it. Doing that will remove swing flaws almost instantly and lead to better shots in the same amount of time.
Have you ever cut firewood? You swing the ax exactly the way you should swing the golf club. You balance the entire axis. Both ends of the shaft, the handle and the head, move in the same direction at any time. That may sound obvious, but it’s a more subtle point than it seems.
Hold a golf club in front of you, with one hand in the middle of the handle. With the stick hanging vertically, move your hand to the right. The end of the grip and the clubhead move in the same direction. This is how the ax moves when you lower it into the wood. You know that’s how you get maximum power, so that’s what you do.
Now, with the club hanging vertically in front of you again, push the end of the handle to the right and, using your hand as a pivot, let the club head react to the left. The two ends of the stick move in opposite directions. If you swing the ax this way, you would not only lose power by slowing down the ax head, but you would also lose wood because the head now flaps instead of continuing in a directed path.
How do you put this idea into your golf swing? Swing the stick back so it doesn’t spin at all. Deliberately breaking your wrists will do that. Retrieve the stick as a unit and let your wrists snap when needed. Not before, not after.
On the downswing, do the opposite. Swing the club down as a unit and hold the wrist break until the momentum of your swing releases it. If the wrist break is released too soon, this is called throwing, a short name for the two ends of the stick moving in opposite directions.
To see how this really works, hold the club in your right hand (left hand, for left-handed golfers) in the middle of the shaft. Slowly move the stick back so that both ends are moving in the same direction, i.e. there is no twist around your hand. Now slowly move the stick down, again noting that the whole stick moves as one unit. There is no twist around the hand as the clubhead enters the ball, nor does the shaft roll back as the clubhead advances.
Once you understand this idea, start taking slow practice swings so the club moves exactly like this. When you can put this motion into your swing at normal speed, you are assured of a better ball stroke.