The textbook consists of two sections: theoretical and practical. The theoretical part of the textbook outlines the foundations of modern computer science as a complex scientific and technical discipline, including the study of the structure and general properties of information and information processes, general principles for constructing computing devices, issues of the organization and functioning of information and computer networks, computer security are considered, key concepts of algorithmization and programming, databases and DBMS. To control the acquired theoretical knowledge, self-testing questions and tests are offered. The practical part covers algorithms for basic actions when working with the word processor Microsoft Word, the spreadsheet editor Microsoft Excel, the program for creating Microsoft Power Point presentations, archiving programs and anti-virus programs. To consolidate the completed practical course, at the end of each section it is proposed to complete independent work.