Ubuntu LTS User Guide for IT Professionals: Practical System Administration, Security Hardening, and Real‑World Deployment Techniques.

Windows Security for IT Professionals: System Hardening, Threat Mitigation, and Access Control Techniques

Ubuntu Server 24.04 LTS in Practice: Secure Configuration, System Administration, and Production Ready Deployment

Ubuntu Server 24.04 LTS in Practice: Secure Configuration, System Administration, and Production Ready Deployment