In order to have a proper swing, you need to grip the golf club properly. If you grip it too tight or loose it will affect your swing greatly. The same thing will happen if your grip is rotated to far back or forward on the club. Golf swing trainers will tell you to slowly swing the club to see where the head fully connects with the ball. Then you can adjust your hands to the way that best suits you.
When giving stuff away, some people make the mistake of giving a "shallow" sample of their product. For example, to promote their book, they show the Table of Contents free. But that's like a car dealer trying to entice somebody to buy a BMW by giving them a test drive in a Volkswagen Gol