It’s peer-to-peer like torrents, but on its own network. Use can share anything but it’s primarily used for music. You set a folder to share from and if someone looks up a file you have, they can download it from you.

If you really wanted a WebUI could install Cockpit with the File Sharing extension.

I’ll only really use .com or .net, with the exception of .cc, which are for short domains.

Hoarder has just released support for SingleFile also. You can set Hoarder as a save location in the SingleFile extension.