Read greens by selecting the high point of the putt between the spot and the hole, and let the contour of the green bring the ball into the hole
Your ball positon should match the low point of your swing, so it changes with each club and depending on whether you want to hit the ball regular or with a special shot like a draw or fade
There are four sources of power in your swing: the wrists, the arms, the pivot and your ability to syncronize and time the movements