1. Never shake hands while sitting.
2. Protect those behind you and respect those next to you.
3. Never insult the cook when you are the guests.
4. Never eat the last piece of something you didn't buy.
5. Never make the first offer in a negotiation.
6. Don't take credit for work you didn't do.
7. Take blame and give credit where it is due.
8. If you're not invited, don't ask to go.
9. Always aim for the head.
10. Don't beg for a relationship.
11. Dress well for any occasion.
12. Always carry cash with you.
13. Listen, nod, and above all, look into the eyes.
14. Show restraint in expressing your anger, no matter what. Getting angry is a waste of energy.
15. Whether it's dinner, an aperitif, or both, avoid placing your phone on the dining table.
16. Never pose with alcohol.
17. Correct grammar will take you far in life. Leave foul language to the less educated.
18. Ask for more than you give.
19. You can tell a lot about a person from their handshake, so it's best for it to be strong and firm.
20. Speak honestly. Say what you mean and mean what you say.