https://trash-guides.info/

This doesn’t cover Jellyfin but the rest of the stack the gets files into it. And frankly I disagree with a number of the ways that they do things but if you want a guide that gives you a setup that works with a community that is helpful (they have a well populated discord) this is a good starting point

Jellyfin is basically install it, create a library within the app, point said library at a folder on a drive somewhere with media on it.

You generally want to follow reasonable naming conventions, eg showname.s01e01.mkv but these have gotten fairly flexible over the years. You don’t need to worry about the extra stuff like webdl.1080p.flux.proper etc, that is typically ignored, though there are always edge cases. The bigger headache is making sure your files match thetvdb or themoviedb as this is primarily what Jellyfin will use for scraping. If you use sonarr/radarr you can ensure the files are properly ordered and even rename them to scrape perfectly but this can be a headache for seeding if you torrent as renaming the files will break shit. This gets you into needing to hardlink if you want to keep things automated unless you want to manually go in and rename the files in your torrent client which is a chore, the trash guides describe how to set this up

Anime can be a chore, especially older releases, because lots of good shows were released by random people and not groups. As a result they decided to just release things with sequential numbered episodes (eg instead of s01e01,02, etc it’s just a folder with 1.mkv, 2.mkv, etc). Or they released them with episode numbering that differs from what tvdb has because they insist that some other source like anidb is gospel. Certain western shows can be a nightmare because of stuff like this too (American dad is the worst)

From there it depends on how you want to customize your Jellyfin install. I use a kodi as a front end so the only plugin I bother with is Jellyfin for kodi. But before that when I used native clients I used jelly scrub, introskipper, etc. but a lot of those plugins are redundant now because they’ve been built into native Jellyfin.

You also may need to set up transcoding. This depends on your setup. My setup direct plays everything (ugoos streaming box with Coreelec/kodi). This is really only necessary if you have a setup that benefits from the direct formats, eg a surround sound setup, oled screen that can play dolby vision or a led that can do hdr10+, etc. or if your server is really garbage and can’t handle transcoding. But really it has to truly be awful; intel quicksync going back years can handle most modern files pretty effortlessly (unless you start messing with stuff like av1 or vp9), nvidia transcoding also works fine even with relatively old cards (though using much more power by nature of needing a gpu installed). If you have an amd cpu video core next works too although quicksync is objectively superior, though not necessarily enough to justify buying a whole new setup and creating a bunch of waste when your amd rig will work well enough.

As you can see transcoding is in and of itself a diverse topic and how you set that up depends on your setup and needs: what’s your hardware, do you need tonemapping, how many concurrent streams do you anticipate having, etc.

It sounds like a lot but if you play with it for like a weekend you’ll be fine and then you’ll be free of streaming bullshit and the associated data collection