The difference between a professional put and an amateur put is in the finish of the put. The professional moves his shoulders directly parallel to the target line while moving his eyes instead of his head to follow the ball. The amateur swivels their entire body to follow the ball which creates an inaccurate shot. This movement lifts the body which completely messes up a shot. For practice you can practice swinging your putter exactly the same path of a straight line. This will help create a swing that creates a square hit on the ball hitting it where you intend for it to go. Follow these tips, and you'll make a lot of puts.