If you're getting close and lipping the cup you pretty much have it figured out, but reading greens is kind of an art rather than a science.
The hole is only 4.25 inches wide so the further you are from the hole the less likely you are to make a putt.
Keep track of how many putts per green and how many putts per round you have to gauge how good you are at putting.
Par is set allowing 2 putts per green, so the goal is to have fewer than 36 putts for 18 holes and average fewer than 2 putts per green.