The shortest known distance between two points on a golf course is a duck-hook.
There are two things you can learn by stopping your back swing at the top and checking the position of your hands: how many hands you have, and which one is wearing the glove.
If you're afraid a full shot might reach the green while the foursome ahead of you is still putting out, you have two options: you can immediately shank a lay-up, or you can wait until the green is clear and top a ball halfway there.
The inevitable result of any golf lesson is the instant elimination of the one critical unconscious motion that allowed you to compensate for all your errors.