For the docker-compose you need to modify the the `/path/to/your/media` to point to where your media is actually located. You may also need to modify PUID/GUID if you have more than one linux account. Usually 1000 and 1000 will work if you followed my A-Z guide.
Optionally you may want to open ports 7359/udp and 1900/udp on your ufw firewall so jellyfin can be discovered if it is installed on a server on your LAN. `sudo ufw allow 7359/udp comment "jellyfin discovery"` is an example command to do this.
If you need remote access. Make sure you login to the admin panel. Click on Networking under Advanced. Then scroll down and check a setting that says "Allow remote connections to this Jellyfin Server.