I'd add the "have clear rules" concept to this and enforce the rules. Don't be wishy washy. But communicate the rules and be prepared to explain the rules.
But also accept that theory and practice are not the same. Imo you should allow them enough, that they don't isolated from their friends experiences. That is why I allow them to play Roblox under supervision or why I set up a Minecraft Server so that they can play online with their friend in a safe environment (but only on weekends for a fixed time period).