This link explains things fairly quickly for all debrid, the service I use is real debrid which you can follow identical steps for setting up: https://www.desidime.com/discussions/use-stremio-debrid-all-debrid-real-debrid-for-watching-content#:~:text=Debrid services are basically torrent,and windows%2C and works seamlessly.

The idea is essentially debrid services download the content of a torrent, and once one user has requested them, its stored and available for all other users to download, so no more dealing with Torrents with 0 seeders, at the speed of top grade file hosting services. You could use it for downloading content quicker and storing it on your local drives.

You can get unlucky on the odd occasion, theirs some torrents out there where the actual video file format isn’t friendly with streaming, but RealDebrid itself has been 100% reliable, for me anyway. If your using stremio their are settings you can change to increase the cache size, or you can play around with using a different video player within stremio, but in general the default settings should do the job.

Stremio combined with RealDebrid is untouchable. Almost every show and movie you could ever think of, ready to go.