The most important aspect of putting is to have the putter head come back inside the target line to avoid creating angles
A common fault in the one plane swing are thin shots because the club path is pitched to the right, fix this by delivering the club to impact with your arms swinging to the left and pulling your shoulders.
Using your driver to practice accentuates errors in your swing, especially if you slice, and low handicappers can use it to practice shaping their shots