Mine doesn't like scary movies, so TBH I even vet a 12 to make sure there's no blood or spooky stuff.
Computer games the same - although I'm a bit more relaxed and so are they about cartoon violence (eg. cuphead). They aren't allowed to chat with randoms or use their real names though, and if I see something I don't like, then they have to uninstall it.
No swearing. Don't even like him saying stuff like 'crap' and will pull him up on it (I also don't swear, neither does his older brother)
Bedtime is 8:30 with no fuss. If there is any fuss, then he knows I'll pull bedtime back to 8pm (we are all up by 6 at the latest). He's allowed to read in bed for a while as long as when I walk past at 9 he's put them away (and he's good, he always has)
They don't have screentime limits, but again, if I ask them to stop or put it away they must, without fuss, or screentime limits will be imposed. No devices in the bedroom.
He does have is own phone - but that's because it was part of the deal to persuade him to visit my ex. He only has it when he's visiting his dad, in case he wants to call me to come and get him.