E.g. Do not steal, tell the truth, be polite… Bonus points for interesting ones.
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survival of the fittest
The young generation respects the old generation and vice versa. The old were young once, the young will turn old.
Not that is is always followed of course but I believe that it is instinctual for us (and other social animals) to protect our children. Harming children is seen as one of the worst things you can do.
Never give attention to trolls, promptly downvote and don't engage in conversation. Also covering a comment lol
If you visit another country and learn to say hello, thanks, please, good bye in the local language you will be welcomed nicely. Even if you say it wrong.