I wish I had learned how to have successful relationships with women in college, though of course college generally doesn't teach that unless certain classes in psychology and human sexuality offer some useful information. Because our culture leaves something this important to the haphazard, if you can't get the foundations for that man's skill set in high school, and if you go to college and can't get the right kind of "remediation" there, then as an adult you face some serious problems which extend to other areas of a man's life beyond just the impaired ability to pair up with women.
The most important thing that many pyschology courses offer on the subject is probably that a majority of women attend.
I was looking at a discussion of what should be in a college curriculum, and as such discussions seem to go, there was a big list of things everyone should study, and some political claims about what's being offered but shouldn't be.
Instead, what do you wish you'd studied in college? What do you wish other people had studied in college? On the latter, do you think everyone should have studied it, or do you just wish more people knew about it? Approximately what percentage of people?
Of course, this doesn't have to be limited to college. People could learn the same things earlier or later.