The Hideout is a really good website for children and young people.
Here is the link
It gives you really good advice about keeping safe.
If you feel unsafe while you’re looking at this website…
On every page you will see a button that says Hide my visit. When you click on this button another web page will immediately appear on the screen, so that no one can see that you were actually visiting us. You can use this button at any time if you feel unsafe while visiting for example if someone walks into the room and you do not want them to know about what you’re reading. If you want to return to us at any time, just click on the ‘Back’ button at the top of your computer screen.
Emailing links to friends…
You might think that one of your friends would find the information on this site, or any of the other websites, useful. Make sure you check with them before you email them the link, to make sure that it’s safe to send them this information via email.