: Once it reaches 100%, it is polite in the torrent community to leave the client open for a while to "seed" (upload) the file to others.

: You cannot open these files with a web browser. You need a "client" to manage the download. Popular, lightweight options include qBittorrent (open-source) or Transmission .

: Once you confirm, the client will connect to "seeds" (people sharing the file) and begin downloading.