Part 1. Fundamentals of computer science. Part 2. Basic information technology. In the first part of the textbook, an introduction to the subject of computer science is given, the components of the discipline, the technical and software of computer science, the mathematical foundations of computer science, an introduction to the theory of algorithms, as well as the basics of the user's work in the Windows operating system environment are considered. Work in computer networks and information security tasks are considered. The first part ends with the study of the issue of computer modeling in scientific and technical research. The second part of the manual is devoted to basic information technologies, primarily technologies for processing data and solving computing problems in various software environments, processing text and graphic information and working with databases.