Meta-lesson: if you want to learn more wisdom, experiences are key. Get a diversity of experiences, do things that are outside your comfort zone and you will collect wisdom. Don't be scared to take detours in life. Travel, socialise with unusual people, try your hand at everything. Never stop learning.

1. Good friends are more valuable than cool friends. Learn who to trust and who's a flake. Remain friends with the flakes, but don't rely on them.

2. Don't stay where you're unhappy. Give it some time, then move on. Try something else.

3. Focus, focus, focus when you're doing one thing. Other times, branch out.

4. When you're young you are time rich and cash poor; when you're old you are cash rich and time poor. Don't put things off until you're older - travelling when retired will not inform your life.

5. The happiest people have good work-life balance. This may not go down well on HN, but having seen people around the world living different lives, this is a general observation. A relative was a counsellor, and he told me "No-one [at the end of their life] ever wishes they'd spent more time at the office." Perhaps working long hours for a while with a view to achieving this balance later is OK.

6. Forget the money. https://vimeo.com/63961985

7. Take holidays. Regularly. Force yourself to.

8. The secret to stamina is sleep.

9. Mix with people of all demographics, or you will end up with a narrow view of life.

10. If you've thought about doing something for a long time, you should probably do it.

11. If you're having a conversation with someone about breaking up with your partner, then it is time to break up, or at least, take a break and see how it feels - don't waste your time and your partner's time procrastinating.

12. In relationships, you should always make extra effort, even when you've already made extra effort. Relationships take a lot of work, long-term. Surprise your partner.

13. Really listen to people. It's such a hard skill to develop. Start today.

14. Realise how lucky you are to wake up with hot water, heating, and nice food. Many people in the world don't have these luxuries. Living on no money when travelling is a good way to learn this.

15. Travel. But don't party the whole time. Often travelling is best done mid-late 20s when you've done the partying thing. Stay with local people. Don't plan too much. Get into the countryside.

16. If you're writing an email and it feels uncomfortable, you should probably not send it. Or at least wait for the morning :-).

17. Sometimes, deciding to do nothing is a decision in itself. Solutions can present themselves.

18. Have a huge party every birthday. Don't fight ageing, embrace it and celebrate being alive :-).

19. Don't criticise things without providing an alternative. If you feel angry in an argument, you're probably wrong.

20. Don't do a PhD straight after you graduate.

21. When in love in a relationship, throw yourself into it. Don't have regrets. Always tell people how you feel. It may be a car-crash at the time, but you'll learn from it and feel better about it your whole life.

22. At the end of your life, they're going to put you in a box in a hole in the ground, and that's it. Every moment of life is precious. When you're on your deathbed, even the idea of one more normal day at work will look unimaginably brilliant. Develop that feeling now.

23. Meditate. Unlearn what you have learned.

24. Whenever you think something nice about a person, say it. There's enough negativity in the world. Love your friends and tell them you love them.

25. Read books. Lots and lots of books. Read "East of Eden" by Steinbeck. You'll see why.

26. In love, in work, in life, never ever settle. It is better to be alone than to marry a person you don't truly love.

27. When giving people advice, they usually only want you to confirm their decision. Listen and talk things over. And even if you do give them advice, they'll just ignore and do what they want in the long-term.

28. Old(er) people are a great source of wisdom, but you won't take their advice seriously until you've experienced it yourself.