RESPECT all other users. "Other users" can be: people waiting to use the computer you are now using, the person who receives your email, the persons you share a computer with, or the people you contact using instant messaging.
Don't use words that you would not use in front of your parent, grandparent or an adult in any email, chatroom or instant messaging program. If someone makes you uncomfortable using these words, ask them politely to stop. If they will not stop, go somewhere else. If they follow you, disconnect from the internet then reconnect.
If you need to send a long email to someone, put the word "LONG" somewhere in the subject line so they know your letter will take a little time to read.
Try not to send someone a file that they can not open because they do not have the same program installed on their computer that you used to create the file.
Don't send your friend a file you know you shouldn't have in the first place.
Respect the privacy of other users. Don't read some else's mail unless they give you permission or your parent instructs you to. Watch out for other internet users (like family, friends and younger brothers and sisters) but don't interfere when they are at a safe website or doing homework.
By follow the rules of your family when you are connected to the internet, you have a much greater chance of staying safe in cyberspace.