Tip #1: Learn how to respect others
You should learn how to be nice with others even though they send negatives comments or posts about you. Just simple ignore them, and/or report them to avoid arguments.
Tip #2: Be smart about what you write online
Remember, this is a public place. Be careful when you write negative post. For example, you want to express your opinion about a topic, then you should be careful. Sometimes people are sensitive. And beware: don't post a negative post about a person. Because it may lead to a big fight.
Tip #3: Remember that this is the public space
Everyone can see your post. So you should be responsible when using social media.
Tip #4: Think before you click
Remember, you should think first before you post or comment something.
PS: Then that's all I can give to you. Questions? Suggestions? Feel free to ask.