Are there any good guides on how to set up a full office domain/realm/network/whatever?

I'm struggling to find any consistent documentation for how to just set up something similar to Active Directory using Linux.

It's quite annoying because it really shouldn't be that hard. There's plenty of guides for how to install Active Directory on Winblows server and connect clients to it. And even a fair number of info about how to set up the dying macOS server thing.

But on Linux, the best option I can find is wasting 50 days hopping around the Red Hat docs. Which are overly verbose to say the least.