csoonline.com
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CSO Online is a security-focused news and guidance site for IT and security leaders. It provides practical articles, how-tos, and best-practice insights on cybersecurity topics, including operating system security, patch management, endpoint protection, and incident response.
More resources on Operating System Security
Kernel Documentation: Security
Official Linux kernel security docs
Grsecurity
Linux kernel security enhancements
SELinux Project
Mandatory Access Control for Linux
LiveOverflow: Introduction to Binary Exploitation
Series on OS-level security exploits and mitigations
Computer Systems Security
Explore operating system security with Nick Weaver's Computer Systems Security course. Learn to build robust, secure systems!
owasp.org
OWASP is a nonprofit devoted to improving software and web application security, offering free, open resources such as the OWASP Top Ten, secure coding guidelines, testing guides, and community projects.