I have a PC hooked up via HDMI to our TV, so my kid and I share our media. We can use the monitor, but we generally don't.
We watch videos together, as we generally have the same interests. His video-watching preferences include science, robotics, and video games. I'm okay with anything educational and/or thought-provoking.
He doesn't have any personal devices, so no phone or iPad or anything like that. I feel that anything portable that can be used privately is not great for a kid (for my kid, anyhow), but he doesn't mind.
He plays games on the Switch & Steam, but usually I'll require chores to be done & a certain amount of reading to be done for equivalent screen time (unless there's a limited-time in-game event or something). He's a very smart and lovely boy, and he rarely ever gripes over it.
It's in any parent's best interest to not only know what their kid likes, but also for them to participate. I've learned to play Splatoon, Minecraft, Enter the Gungeon, watched youTube channels, and learned all kinds of things about the content & mechanics in order to determine if it's okay for him to be playing/watching those particular things.
Seriously: get to truly know what your kid likes.