What are some unwritten social rules everyone should know?

It's I again @Dareem007

Here are few.

1. Don’t call someone more than twice continuously. If they don’t pick up your call, presume they have something important to attend to;

2. Return money that you have borrowed even before the other person remembers lending it to you. It shows your integrity and character. Same goes with umbrellas, pens and lunch boxes;

3. Never order the expensive dish on the menu when someone is giving you a lunch/dinner. If possible ask them to order their choice of food for you;

4. Don’t ask awkward questions like ‘Oh so you aren’t married yet?’ Or ‘Don’t you have kids’ or ‘Why didn’t you buy a house?’ Or why don't you buy a car? For God’s sake it isn’t your problem;

5. Always open the door for the person coming behind you. It doesn’t matter if it is a guy or a girl, senior or junior. You don’t grow small by treating someone well in public;

6. If you take a taxi with a friend and he/she pays now, try paying next time;

7. Respect different shades of opinions. Remember what's 6 to you will appear 9 to someone facing you. Besides, second opinion is good for an alternative;

8. Never interrupt people talking. Allow them to pour it out. As they say, hear them all and filter them all;

9. If you tease someone, and they don’t seem to enjoy it, stop it and never do it again. It encourages one to do more and it shows how appreciative you're;

10. Say “thank you” when someone is helping you.

11. Praise publicly. Criticize privately;

12. There’s almost never a reason to comment on someone’s weight. Just say, “You look fantastic.” If they want to talk about losing weight, they will;

13. When someone shows you a photo on their phone, don’t swipe left or right. You never know what’s next;

14. If a colleague tells you they have a doctors' appointment, don’t ask what it’s for, just say "I hope you’re okay". Don’t put them in the uncomfortable position of having to tell you their personal illness. If they want you to know, they'll do so without your inquisitiveness;