I’ve always recommended the Linux Upskill Challenge. It takes you step by step from the cli to scripting, incrementally. It’s also a good bookmark to reference in the future.

You’ll need networking basics for anything you do (there are lots of courses on youtube).

After that, you can just follow wherever you curiosity carries you :)

If you manage to get Docker Compose installed on that Mac (I don’t know Dockers limitations with Macs) create a docker-compose.yaml file with the contents of;

services:

  jellyfin:

    image: jellyfin/jellyfin

    container_name: jellyfin

    # Optional - specify the uid and gid you would like Jellyfin to use instead of root

    user: uid:gid

    ports:

      - 8096:8096/tcp

      - 7359:7359/udp

    volumes:

      - /path/to/config:/config

      - /path/to/cache:/cache

      - type: bind

        source: /path/to/media

        target: /media

      - type: bind

        source: /path/to/media2

        target: /media2

        read_only: true

      # Optional - extra fonts to be used during transcoding with subtitle burn-in

      - type: bind

        source: /path/to/fonts

        target: /usr/local/share/fonts/custom

        read_only: true

    restart: 'unless-stopped'

    # Optional - alternative address used for autodiscovery

    environment:

      - JELLYFIN_PublishedServerUrl=http://example.com/

    # Optional - may be necessary for docker healthcheck to pass if running in host network mode

    extra_hosts:

      - 'host.docker.internal:host-gateway'

Edit the volumes so that the drive you want to use is exposed to the container and then run;

sudo docker compose up -d

In a shell while in the folder with the docker-compose.yaml file you just created. If everything works then the server should be running on port :8086 open your browser and make an http:// request to the ip of the server followed by the port.

Example; http://127.0.0.1:8096/

Documentation.

Edit: removed unnecessary \

Edit 2: I really should have read the post more thoroughly, while my example above works fine for a Jellyfin server (which you apparently already run) it also can be adapted for other services. Read and interpret the documentation as best as you can, that goes for any service.

For an absolute beginner I would recommend Linux tutorials first so you can navigate the Linux cli.
After that watch some docker tutorials as a significant chunk of self hosting is done with docker or a kube variant but you won’t need to lean about kube yet.

LearnLinuxTV on YouTube has some great playlists for that.