Simple, trust no one. Get a no-reported-logs VPN, don't download anything that has a strange file size or extension, look at comments, look at the number of seeders if it's a torrent. If you can, join something like a private tracker where there's moderation too. If it walks like a duck and quacks like a duck then it's probably not the movie you were looking for and there might be a Trojan army inside waiting for you to let the duck enter your computer... That metaphor may have fallen apart on me...