Allowing yourself to be wrong. Especially as a male.
Instead of trying to figure out a way to still kind of be correct, you just objectively reconsider the facts.
It made me a better adult. I prefixed a lot of my statements with "I think" or "I believe" to emphasis the possibility for me to be wrong. And I'm more inclined to ask questions. (Which sadly gets a lot of people riled up because they have a hard time believing I'm not doing it sarcastically.)