Insight from C.A. Czaja on Backswing.com:
Accurate putting
Posted on: 01 Sep 2021
To putt more accurately you must understand what “square” is. The putter face must be square to the intended line ( perpendicular). Use an indoor putting Matt or get a 2 X 4 piece of wood that can be used as a target tool. Place toe of putter against the inside of 2 x 4. […]