I will share two tips that greatly improved my putting. 1. Take three boards and set them up like the picture. That will make you use the pendulum swing, and not get handsy with it. 2. This is the most important thing I can’t emphasize it enough go practice, practice, and then practice some more.
Do drills the two that I use are 1. Put a tee in the ground 3 foot, 6 foot, and 10 foot from the hole, and start from the three and once you have made 10 in a row move back to the next one. 2. Do lag put drills just start back about 15-20 feet and try to get the ball in a 3 foot circle around the hole. Once you get the 20 footer down work your way back. I have to do these drills a lot as my short game has gone to pot since the birth of my boys.
This one may not be a tip, but when I get in a putting funk I switch out putters for a little while. I just lose confidence in the one I have, and gain a little more over a new one.