What is the best lesson you’ve learned outside of textbooks?

I mean im teaching myself massage therapy, and ive learned how to feel the pressure points but not from a textbook, it comes pretty natural to me.

Socializing

Hubris literally always destroys people. Sometimes slowly, sometimes quickly. Never assume you are the best or brightest or beyond reproach, only people of extreme wealth can play those kinds of games. The rest of us must learn how to survive on the scraps.

The best lesson I learned outside textbooks is that being kind goes a long way. You can forget facts, but people never forget how you treated them.