Port forwarding = better connection = more upload. Im no expert, but without PF you cant connect to everyone. Its kinda important for any proper private tracker, but you can use torrents without one. I like mullvad a lot, but airvpn cost even less and have PF, so easy decision to switch.

Yeah servarr wiki. Well starting with containers and setting everything up was a lot of work for me, but deffo worth it. Next level of torrenting/media server, I would never go back.

You basically install docker and docker-compose, then you can install portainer (also docker container) and use it to install everything else in a user friendly gui. You fill your yaml file with all settings for sonarr, radarr, prowlarr, qbittorrent, etc, and just load it in portainer stacks.