Using Jellyfin in LAN

[elmagnifico852]

Hello,

I'm new here and have a few questions about Jellyfin:

1. Does Jellyfin work via LAN, and if so, does it require additional settings or does it work via LAN by default?
   
2. When it says "online," does that mean I can use it anywhere, or do I need to be on the same network?
   
3. Can I restrict the use of internet data for streaming and limit it to media info, tags, and covers?
   

Thank you.