Breaking putts can only enter the hole in a limited area; by imagining the hole with a piece cut out you can envision the area of entry
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
Do not approach your chipping stance like a full swing stance, keep your feet close together, slightly open, weight on your front leg and shoulders square to the target, this set up clears your hips prior to the shot and puts more of the toe of the club flat on the ground