I can feel that I keep hitting putts on the bottom of my putter. I know this is not right. How can I hit more solid putts and improve my putting?
Typically when this is happening with someone's putting it is one of two things.
First - check you ball position. The ball should be in-line or just in front of your sternum. When my students have this problem the ball usually gets to far forward.
Second - place your hands just ahead of the ball at address and make sure they return to the same position at impact. You should be able to keep the angle that your right wrist creates through to your finish.
One of the golf training aids to help you with this challenge is the Putting and Chipping Brace