- You add the TV shows you want to track, and when new episodes are released (or when it detects you're missing episodes/seasons) it automatically pings the torrent search indexer/s you've connected to find the torrent for that show.
- The indexer then sends back the torrent magnet info to Sonarr, and Sonarr then sends that to the torrent client you've connected it to which starts the download.
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Radarr does the same thing as Sonarr, but with a focus on movies.
In terms of connecting torrent indexers to Sonarr + Radarr etc, you'd want to use either Prowlarr or Jackett to handle that.
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So a general flow could be Sonarr (tracks show and requests new episode) =>
Prowlarr (searches torrents and finds the torrent magnet link) =>
Sonarr (takes torrent magnet link and requests the download to start) =>
qbittorrent (starts the download) =>
JellyFin (scans your media downloads and gives you a media center/streaming interface to watch your shows on your devices)
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Overseer is meant to combine the TV/Movie tracking with content discovery into one interface. This way, you can track your shows and find new ones, and it handles sending those requests over to Sonarr/Radarr.