A friend told me about a good way to practice proper speed
on short putts. The idea is to put a pencil blocking a hole when putting with two tees to keep it in position. If you hit it too soft, the ball won’t roll over the pencil, and would be much more likely to be short, or bounce offline or take a small break around the cup. If you hit it too hard, it will jump in the air and go over the cup. If you hit it with just the right speed, it will go over the pencil and be the proper speed to hit the back of the cup when you’re on the green making a real putt.
I looked online and found this article on golf.com I’m not sure if that’s the original source or not, but I tried it, and it works well. If you find your self missing short putts and hitting them too softly, give this a try!