Courtesy, politeness or having good manners are all about respecting others and yourself.

How would you feel if someone:
talked to your friend but turned his back to you?
pushed you out of the way to get the seat you were about to sit on?
let the door slam in your face as you were about to walk through it?
shared your things but never shared anything of theirs?
never said 'please' or 'thank you'
didn't pass your phone message to your friend?
Good manners is about considering the feelings of other people, and being the kind of person that others will like and respect.
In the ‘olden days children were taught about the Golden Rule - “Always do to others as you would wish them to do to you if you were in their place.”
This is still a good way to behave nowadays. If you are respectful to others, then you are more likely to be treated with respect by them.
If you show good manners everywhere you go, then you are more likely to encourage others to behave in the same way towards you.
Look at the following ideas from kids and see if you can think why they chose these examples of good manners.
----What good manners look like at home ----
being helpful to others in your home
saying 'please' and 'thank you'
sharing and not grabbing and keeping good things to yourself
respecting other people's property and their rooms
helping the family by doing your chores
cleaning up after yourself.
-----Manners at school----
saying good morning/afternoon if you are walking past an adult that you know asking if you can borrow something, not just taking
returning things that you have borrowed
waiting your turn before you speak
saying ‘excuse me,’ rather than pushing past someone
holding the door open for the person coming in, especially if he is carrying something
respecting your own and other people's property, especially school property
saying 'please' and 'thank you'.
----If you are out with other kids...-----
Respect other people.
Be polite to others.
Don't use bad language in public - it is offensive to others.
Let an older person have your seat on buses, trains and trams if there is nowhere for them to sit.
Queue up quietly and don't push.
Put your rubbish into bins, don't leave it for someone else to clean up.
Have fun but don't be so loud that you attract the wrong kind of attention.
------If you are out with your parents or other adults...-----
Use your good manners so that you don't embarrass anyone.
Introduce any friends you meet to the people you are with.
Say 'please' and 'thank you'.
Don't be a 'canna'. (“canna have this?” and “canna have that
---At the table---
* Use your knife to cut and your fork to put the food in your mouth.
* Chew food with your mouth closed.
* Ask for things to be passed to you, don't lean over the table.
* If you need to blow your nose, excuse yourself and go out of the room first.
* Don't grab everything you want first - help others to get their food and be prepared to share.
* Don't talk with your mouth full. It is not a good look!
(Source: cyh.com)