The CentOS project welcomes you to CentOS-6
The complete release notes for CentOS-6.9 can be found online at http://wiki.centos.org/Manuals/ReleaseNotes/CentOS6.9. A list of frequently asked questions and answers about CentOS-6 can be found here : http://wiki.centos.org/FAQ/CentOS6.
If you are looking for help with CentOS, we recommend you start at http://wiki.centos.org/GettingHelp for pointers to the different sources where you can get help.
For more information about The CentOS Project in general please visit our homepage at http://www.centos.org.
If you would like to contribute to the CentOS Project, see http://wiki.centos.org/Contribute for areas where you could help.