I got my undergraduate degree in Finance from a major university over 30 years ago. Only one thing that one of my professors told me has stuck with me all of these years.
If you pick stocks completely at random you will do better over time than over 50% of the professional money managers.
An experiment was done one time where a chimpanzee picks some stocks along with several people. They chimp did as well or better than the rest. I remember that from one of my finance classes.