What are some unwritten social rules everyone should know?

-Always carry cash. (you never know what might happen on the road)
-Smile when you shake hands. (ensures confidence and trustworthiness)
-If you are not invited, don’t go. (unless extremely necessary, ofc)
-When in a conversation, wait for your turn to speak. (makes you more likable)
-Start saying Yes and No without explaining an entire story. (Yes and No tells a lot)
-Never say no if a poor friend/relative invites you to dinner or lunch. (eat less but eat)

(Ảnh: Quora, sưu tầm internet)

-If someone accidentally slips or spills a drink, help them instead of looking at them awkwardly. (we all go through this)
-Don’t ask a girl her age. Nor a man his salary.
-Never try to outsmart your teacher or your father. (If you know they’re wrong, explain to them why)
-If you don’t like someone’s specific habit, never tell others about it; instead to them in private.