Obviously, the old Marvel Televison had a lot of shows made for the MCU, and they were often catgorized into groups.

We had:

* The ABC shows: Agents Of S.H.I.E.L.D. and Agent Carter
* The Netflix shows (aka the Defenders Saga): Daredevil, Jessica Jones, Luke Cage, Iron Fist, The Defenders, The Punisher.
* The Young Adult Shows (no one calls them that): Runaways and Cloak & Dagger.

Obviously, they're all very connected in their groups. Agents Of S.H.I.E.L.D. had some Agent Carter cameos early on, and no spoilers but a member of the Agent Carter cast joins the AoS cast in S7, so those are pretty tied together. The Netflix shows are really interconnected, I don't need to explain that. The Young Adult shows (that is such as bad name), had a crossover when Cloak & Dagger guest starred in an episode of Runaways S3.

Beyond that, there wasn't much between the three groups. Daredevil had a couple Agents Of S.H.I.E.L.D. references, Luke Cage and Cloak & Dagger referenced each other, the version of the Darkhold that was in Agents Of S.H.I.E.L.D. was in Runaways, but there's not much, if anything beyond that.

And because I'm better, I will acknoledge that *technically* Inhumans was a part of the ABC shows, and is semi connected to Agents Of S.H.I.E.L.D. as they acknowledge the wider presence of Inhumans on Earth, but that's it. Also, Helstrom and Adventure Into Fear was a whole thing, that was meant to be a fourth group of shows, and also have Ghost Rider that would've technically been an AoS spinoff, but that never worked out because Helstrom was released as a project that was not a part of the MCU, and confirmed to not be canon by the showrunner.
I wish that the Marvel Television shows interacted more beyond their groups