With this image, you can see the three main types of putting strokes, namely:
Straight Back Straight Through: Players that have a straight path should consider using a face-balanced putter.
Slight Arc: Players that have a moderate arc should invest in a putter with a medium amount of toe hang (between 25 and 45 degrees).
Strong Arc: Players that have a strong arc will find that a maximum toe hang putter complements their natural path. If this applies to you, you should find that the putter feels very balanced as it moves along your ‘inside-square-inside’ putting path.