Manner #1
When asking for something, say "Please."
Manner #2
When receiving something, say "Thank you."
Manner #3
Do not interrupt grown-ups who are speaking with each other unless there is an emergency. They will notice you and respond when they are finished talking.
Manner #4
If you do need to get somebody's attention right away, the phrase "excuse me" is the most polite way for you to enter the conversation
Manner #5
When you have any doubt about doing something, ask permission first. It can save you from many hours of grief later.
Manner #6
The world is not interested in what you dislike. Keep negative opinions to yourself, or between you and your friends, and out of earshot of adults.
Manner #7
Do not comment on other people's physical characteristics unless, of course, it's to compliment them, which is always welcome.
Manner #8
When people ask you how you are, tell them and then ask them how they are.
Manner #9
When you have spent time at your friend's house, remember to thank his or her parents for having you over and for the good time you had.
Manner #10
Knock on closed doors -- and wait to see if there's a response -- before entering.
READ FULL ARTICLE HERE:
https://www.parents.com/kids/development/social/25-manners-kids-should-know/