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
Put a plastic ball between your knees in order to take your backswing with your torso rotating more than your hips, disassociating the lower body from the upper body and creating more power in your swing
One of the most common faults in the swing is taking the club back outside, to fix this many players try to control the clubhead but in the swing it is actually the club handle that controls the clubhead so put a tee in your grip and measure your handle distance from your body through the swing