Book excerpt: The aim of this book is to explore the definitions and fundamentals of offensive security vs defensive Security and describe the different tools and technologies for protecting against cyber threats. The book offers strategies of a practical aspects of cybersecurity and covers the main disciplines needed to understand cybersecurity and demonstrates ethical and legal concepts of cyber activties. It presents important concepts relevant for cybersecurity strategies, including the concept of cybercrime, cyber defence, protection of IT systems and analysis of risks.