"What's The Best Site To Download Video's?" I guess he means movies.
Simply there isn't really one. If one turns up they usually get shut down preitty quick. Also because of the large file sizes it's not really feasable to host films from a website. The best thing to do is get an FTP client such as FlashFXP then connect to someone you know's FTP server and get the stuff from them. Or get another peer to peer file sharing app like TribalWeb.