As of 2015, there are many free, public torrent indexing websites, such as Torrentz.eu and IsoHunt.to. Install and use a BitTorrent client, such as Deluge, to download content via torrent files.
Torrent websites are known to often change domains, and certain sites have gone offline due to legal issues relating to copyright law. It is important to respect copyright law when using torrent sites, because many torrent sites index torrents that include pirated content.
Be wary of malware when using torrent sites. Websites such as TorrentFreak.com regularly publish articles that list the most popular and trustworthy torrent websites that are useful if there are doubts about the authenticity of a torrent site.