My 2 are now in their 30s. We think we did a pretty good job.
It was a roller coaster from 'needing' Mum and Dad to pretty much ignoring us. We still had family times together but they were fewer and further between. Don't force 'occasions', let it happen. Try to find things they'd want to do, even if you don't. We did a lot of movies and sports events as well as guitar and video game stores. I know, not very 'cultural' or 'edifying', but there were some good talks during these outings. It's about making them want to go, want to be with you.
Their 'primary' source of support and information became their friends. Because of this I suggest you watch their friendship group very carefully. Quietly and from a distance, but still watch. Teens, even the brightest, can be susceptible to peer pressure. We quietly reinforced the old axiom "Lie down with dogs, get up with fleas".
As they started to 'pull away' they became a bit stroppy and smart mouthed, but nothing that a stern look, an 'Excuse me?', and an occasionally grounding didn't deal with. It's about allowing them reasonable independence to make decisions but knowing when it's time to step back in and say "No".
Technology wasn't a 'thing' when mine were teens, other than (non-smart) cellphones. The 'family' computer was kept in DH's office. I have to admit I'm glad I'm not raising kids in the 'internet age'.
The things you 'did' when they were 10-11 won't work once they're 13. You have to find a new path. And let them find theirs.