I've been on the internet since I was a similar age. I even obeyed all my parents' instructions (e.g. no using Google, no social media), but it's really only me being a certain kind of person – and a little luck – that kept me in any way resembling safe. Those rules, as stated to me, were absolutely not sufficient (e.g. I used Bing, and joined forums, and booted into QuickWeb to play
The Fancy Pants Adventures because that wasn't
disabling the filter). No way were my parents capable of policing my activity.
I, uh, mostly kept my parents in the loop, I guess? But they had to intervene and fix my messes on more than one occasion, and those were all things I hadn't told them about (some of which I even realised were big deals before they blew up). I'm quite lucky that none of that stuff's come back to bite me yet. (I don't think any of it was criminal, but that's pure serendipity: I had zero idea what the laws surrounding internet activity were, and I could easily have made an enemy of multiple governments without even knowing I should probably ask my parents about this cool new programming idea I had.)
The places I frequent these days are all safe for the kind of child I was, but the internet is much, much bigger than that – and, I suspect, more hostile than it was. I have no illusions that I could provide good, useful guidelines to a ten-year-old today.