Welcome to Hive!

Hive is in the process of becoming something, so it is hard to keep track what it is.

Maybe it's the best to find home in one of the communities, to start with.

I spend a lot of time on leofinance, which is the biggest community on Hive. You can find it as a community on Hive, but it also has its own frontend at leofinance.io

They are all built on the Hive blockchain. Some of them have their own frontend, some of them with different 'rules'. Some different currencies (tokens built on Hive, Hive-Engine).

You also have different frontends to Hive itself. You should look at peakd.com, I find it's the best.

down the rabbithole you go ;)