Book excerpt: The book Defensive Cyberspace: Navigating the Landscape of Cyber Security contains 13 chapters. They are given as follows: 1. Introduction to Cyber Security 2. Foundations of Cyber Security 3. Cyber Threat Landscape 4. Risk Management in Cyber Security 5. Network Security 6. Endpoint Security 7. Identity and Access Management 8. Incident Response and Forensics 9. Security Awareness and Training 10. Securing Cloud Environments 11. Emerging Technologies and Cyber Security 12. International Cyber Security Collaboration 13. The Future of Cyber Security