Originally Posted by 4fingerninja
i just wan to extend my information on a lot of linux distros
Than CentOS is great, it's one of the most common distro's to see on web servers. And unlike RHEL, CentOS is completly free.
Basically with Linux you have your two major variants, BSD based and Debian based. Ubuntu is an example of a very popular Debian based, whereas RHEL and CentOS are BSD based.