Lefties Only Golf Tip: Most people, when they start of playing the game of golf, they're going to start off with a fairly traditional putter and a fairly traditional putting style. It's just the putter that comes with your first set or your first golf teacher or the person that lets you play golf, would probably encourage you to play with a fairly traditional sort of grip and fairly traditional putting style.
Left Hand Golf Tip: How to Select a Putting Style (Video)