As others have said, grab a torrent client and go to town. Transmission is a default torrent client in many distros, but there are all sorts of them and you can find one that works best for you.How do you do it?
Grab Transmission and, if you're downloading software, verify your downloads always without exception. Go to the manufacturer page and get the signatures and hashes, and verify them, before using what has been downloaded.How do you do it?
sudo apt purge <torrent client name>