Red Hat Training
A Red Hat training course is available for Red Hat Enterprise Linux
19.3. Security
Security Guide
The Security Guide is designed to assist users and administrators in learning the processes and practices of securing workstations and servers against local and remote intrusion, exploitation, and malicious activity.
SELinux User's and Administrator's Guide
The SELinux User's and Administrator's Guide covers the management and use of Security-Enhanced Linux. Note that managing confined services, which was documented in a stand-alone book in Red Hat Enterprise Linux 6, is now part of the SELinux User's and Administrator's Guide.