I mean, I basically just download anything that's not an executable. So if its a video, audio, pdf, epub, etc... I don't worry about it. Its very rare for an updated system to get infected from a random .mkv.
I just use (https://fmhy.net/torrenting) one of the torrenting aggregators because its the most comprehensive search, I found an anime that I couldn't find anywhere else because there are dead torrents with no seeders everywhere else I looked.