Advice on how to be a smart Internet user:

Be careful, you do not know who is behind the screen!
Limit personal data (do not give your surname, name, phone number, address, etc.).
Use a username without personal info.
Never accept a meeting without discussing it with an adult you trust.
Remember to protect your webcam (with a post-it or a mask).
Don’t forget that everything is not always the truth on Internet.
If an image bothers you, quickly leave the site and talk about it to someone you trust.
The friends of friends, are they really your friends?
Always activate the confidentiality setting!
In order for the internet to stay clean: no insults, humiliation or revenge, the law forbids it (and your morality also)!