Source: playgolf www.teacherofchampions.com
Summary of Key Putting Tips:
The most popular grip is the reverse overlap grip
The term reverse comes into play because unlike the normal grip use in your golf swing, the index finger of your left hand over laps the fingers of your right hand.
You want the club to fit more in the middle of your hands as opposed to your fingers and both thumbs down the middle.
Your left hand thumb runs down the middle of the shaft and your left index finger can run down the fingers of your right hand.
This helps keep your wrist still during your swing