The waggle during the set up is a very important part of the swing because it keeps your muscles relaxed so that you can start your swing smoothly
Vijay Singh is a great swing to model because he has great freedom through his swing, allowing him to get a great hip and shoulder turn and unload on his downswing through to an extended finish position
There are two types of players, those that putt on a path versus those that putt on a line, the path putter work more on feel and seeing a wide path to the hole while line putters are very specific, need a line on their putter head, and see a think line directly from their ball to the hole