Like Tavi suggested in the post below, I like Kickass Torrents. (PirateBay is more popular though.) You can go on their website and type in whatever you want to torrent. But first, you have to download BitTorrent or uTorrent (either one is fine), which allows you to download torrents. When you enter in your search, a whole list of torrents will appear. For faster downloading and better quality, click on the link with the most number of seeders. On the page where it shows the description of whatever link you clicked on, there is a "download torrent" button. (If using PirateBay, a pop-up might show up with a whole page of code and gibberish. Just click to continue the application and the torrent will continue on.) BitTorrent or uTorrent will pop up to show you what you are about to download and what folder it will end up as in your computer. Just click "okay" and you're done with all the clicking! Just wait until your computer tells you the torrent is done downloading, so you can watch whatever it is you downloaded.
Be careful of viruses though! Before torrenting anything, you should definitely have a virus protection program (Avira, Avast, Norton, whatever).
How to download torrent?? Thank u ^^