Exactly what TMT said. There are several different versions available on that site.
You can also do a quick search of the Linux forum on this site, as there have been people asking about which distro is the best. A lot of the people that have responded have said a little bit about their choices.
Another site I suggest you go to, especially if you don't know anything about Linux, is www.linux.org.
They have some tutorials available there. Of course, if you have problems, there is always someone available to help.