Security of Operating Systems : Training manual for students of higher education institutions , students in the specialty 09010" by Alexander Alexandrovich Bezbogov , Alexey Vyacheslavovich Yakovlev and Yuri Fedorovich Martemyanov are an indispensable resource for students , seeking to deepen their knowledge in the field of information security. With the rapid development of technology and an increase in the number of cyber threats, understanding the basics of operating systems security becomes not only desirable, but vital for future specialists. The book covers a wide range of topics related to the security of operating systems, ranging from the basics of theory to the practical aspects of information protection. The authors examine in detail the architecture of operating systems, access control mechanisms, as well as methods of protection against viruses and malware. An important part of the manual are the sections devoted to the analysis of vulnerabilities and methods of their elimination, which makes it relevant for those who want not only to learn the theory, but also to apply knowledge in practice. This tutorial will be especially useful for students of technical specialties, as well as for anyone interested in information security, programming and system administration. The book is suitable for both beginners and more experienced readers who want to systematize their knowledge or prepare for exams and defense of diploma papers. It can also be of interest to practitioners who want to update their knowledge of modern threats and methods of protection. The topics raised in the book are extremely relevant in the modern world. In the face of constant cyber attacks and data leaks, understanding the operating systems and their vulnerabilities becomes a necessary skill for any IT specialist. The authors emphasize the importance of an integrated approach to security, which includes not only technical measures, but also organizational aspects, such as training users and creating a safe environment. The style of the authors is characterized by accessibility and clarity of presentation, which makes the material easy to perceive. They use examples from real practice, which allows readers to better understand how to apply theoretical knowledge in life. Bezbogov, Yakovlev and Martemyanov are experienced specialists in the field of information technology, and their expertise is felt on every page of the book. Their previous work is also devoted to security and system administration, which confirms their in-depth knowledge in this area. “Operational Security” is not just a manual, it is a guide to the world of information security, which will help readers not only to master the theory, but also to develop the practical skills necessary for a successful career in IT. If you are looking for a book that will help you understand the complex security issues of operating systems, this work will be an excellent choice. It will be useful for both students and practitioners seeking to stay at the forefront in the rapidly changing world of technology. Do not miss the opportunity to get acquainted with this tutorial, which will become your reliable assistant in studying the security of operating systems and will help you confidently step into the world of information technology.