Torrenting with a seedbox for me. I'm aware of Sonarr/Radarr and other automation tools but I don't feel like I have the need for them. Some part of me enjoys the manual search and management. Never touched Usenet though it's in the mental "maybe try later" bin.
I'd recommend giving Sonarr and Radarr a try at least. Setup is pretty straight forward but it goes way in depth if you want to work out the little intricacies of managing your media.
Because setup is easier, Docker basically sets up a completely new environment for the app to live in mostly isolated from your main system, so all the stuff you installed on your system has no effect on it.