When learning a new exercise, it's a good idea to learn "proper form" to reduce the chances of injury, increase efficiency, etc. It's usually recommended to "run with proper form", "perform a bench press with proper form", or "climb with proper form". However, there is a lot of conflicting information regarding what proper form actually is for any given exercise. It seems like everyone has a different idea of what proper form actually is.
So, given that there are multiple ways to do any exercise, how can I verify that I'm doing things the best way possible, and not in person X's favorite but unverified way? Is there an independent body that produces scientific information on this topic?