- History and theory of modern and contemporary art - then it's easier to understand everything in the museum and you won't ever say "I don't get modern art" and "Modern art is a shit".
- New language - I believe trying and learning only few words is worth it!
- How to dress (including how to buy clothes).
I still have a lot of misfitting shirts in my wardrobe and this old masculine perfume my grandma gave me when I was 16.
I see why I wasn't comfortable with these. It takes some time, especially if you don't want to spend a lot of cash at once. But when you know how to dress, you feel more confident look good and feel better with yourself.
By "how to dress" I mean finding your style, not having suit 7 days a week.
Here is a nice article about fabrics: https://www.nytimes.com/interactive/2019/climate/sustainable...