This video is an absolute gold mine. I doubt most people will recognize the value in this video because it's so short and simple -- but let me assure you this advice is priceless.
What you should take away from this is that putting is a deceptively simple part of the game. Reading a put is easy for the most part. The putt might go uphill right to left. Once you have that it's time to trust your instincts. Let your brain figure out how hard to hit the ball based on how far your eyes perceive the hole to be.
Once you start believing how simple the concept is you'll realize the different between a good putter and a great putter is practice. Tiger Woods has an amazing work ethic and he spends the appropriate amount of time working on his short game. That amount of time should be over 50%. I know it's boring to take hundreds of puts instead of blasting drivers. But the truth is that at most you'll be hitting the driver 14 times during a round. At the least, you'll be taking 18 putts. Think about it.