Some relatively new Linux documents that should be reviewed:
http://docs.fedoraproject.org/security-guide/ – an introduction to system security for Linux systems.
http://docs.fedoraproject.org/selinux-user-guide/ – the MISSING document! One of the challenges with SELINUX has always been a lack of adequate documentation. SELINUX has been a pain since it was introduced – things ‘quit working’ and after some period of [...]