Documentation confusing

Does anyone know where I can find documentation for version RHEL 6.5? Every time I use the documentation system it sends me to RHEL 7. I try some of the commands it suggests and get a command not found message. When I do a search for a answer, I get a list of links and when I link to a document I have cannot tell what version or version number the document is talkiing about.

There is also no search or filtering device in the documentation section, itself.

I found RHEL 6 deployment docs but I go into, for example, DNS section and it talks about a /etc/named directory and a /etc/named.conf file. I don't have those. What's up with that?

Some commands I got from other docs,
localectl list-locales
hostnamectl status
systemctl --help
All return "command not found". What's up with that?

Very difficult to get basic advice.

Any help appreciated.