What is the difference between a center-shafted putter and a heel-shafted putter?

Answer 1

a center shafted putter is when the the end of the shaft connects to the middle part of the top of the head of the putter, a heel shafted is when the end of the shaft id connected to the top part of the heel (closest part of the head to your feet when you set up) of the head

Answer 2

The names pretty much answer the question. A center-shafted putter looks like a T, with the handle fastened to the center of the putting head. A heel-shafted putter looks like an L.