Does anyone have any resources for teaching Internet safety to an 8yr old?

My little brother is 8, and with permission is only allowed on some websites, but he's getting to the age where his friends are starting have tablets and phones that have access to the internet.
I have shared the basics with him (don't share personal information, be wary about what websites to go on, don't click on links unless its from an expected source and you're expecting it, etc) but I'm struggling to remember and teach some of the little …

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