RHEL 6 OS Hardening procedure

Hi

I am new to Linux environment. We have started setting up RHEL Servers and as part of going forward, we are looking ways to harden the RHEL 6 OS that we are going to use. We are not going to use this servers in a domain environment. This servers will be standalone.

Could some experts from the Linux community let me know the simple and best procedure to get the OS Hardened?

Looking forward for some assistance from the community.

Regards
Jo