Linux

Jumping in over your head is how you learn. Just be patient!

So, Jellyfin is one of those apps where the Docker documentation is really lacking. I'm gonna give you my docker-compose.yml file in case it helps:

services:
  jellyfin:
    image: jellyfin/jellyfin
    user: 0:0
    restart: 'unless-stopped'
    ports:
      - '8096:8096'
    environment:
      #- JELLYFIN_CACHE_DIR=/var/cache/jellyfin
      #- JELLYFIN_CONFIG_DIR=/etc/jellyfin
      - JELLYFIN_DATA_DIR=/var/lib/jellyfin
      - JELLYFIN_LOG_DIR=/var/log/jellyfin
    volumes:
      - ./config:/config
      - ./cache:/cache
      - ./data:/var/lib/jellyfin
      - ./log:/var/log/jellyfin
      - /data/jellyfin:/data/jellyfin
    devices:
      - /dev/dri

For me /data/ is my RAID array, which is why my jellyfin data directory is there. Everything else goes in the same directory as the compose file. My system has a graphics card that does transcoding (Arc A380), so I have /dev/dri under devices.

You should learn a lot about Docker Compose, because it will help you tremendously. I use Jellyfin behind an Nginx Proxy Manager reverse proxy. I'd highly recommend it. Here's my compose file for that:

services:
  app:
    image: 'jc21/nginx-proxy-manager:latest'
    restart: unless-stopped
    network_mode: "host"
    #ports:
    #  - '80:80'
    #  - '81:81'
    #  - '443:443'
    volumes:
      - ./data:/data
      - ./letsencrypt:/etc/letsencrypt

Running in "host" mode is important, instead of just forwarding ports, because it lets you forward things to localhost, like pointing https://media/.[mydomain]/ to http://127.0.0.1:8096/ for Jellyfin.

Anyway, best of luck to you, and I hope that helps!