This book will be helpful for anyone who wants to master the domestic operating system Astra Linux "from scratch". We will start with the basics of Astra Linux - explaining how to choose the right version for you and install this operating system, set up the Desktop, and review the Control Panel. Next, we will move on to frequently used actions that almost every system user encounters, such as working with files, configuring network connections and Wi-Fi, and installing and setting up a printer, etc. Office applications LibreOffice and WPS Office, graphic editors (GIMP, Inkscape, Krita), and multimedia programs for audio work, video viewing, or music playback (VLC Media Player, Audacity, etc.) will also be covered. Chapters dedicated to administration, working with graphical interfaces, and the command line will be useful for not only beginners but also more advanced users, and by learning how to set up automation for various everyday tasks using scripts, you can configure this system's usage and save your time. Special attention will be paid to security when working in Astra Linux: we will explain why data backup is needed and the best ways to do it, review the restoration of the operating system after a failure. For business people, it will be useful to learn how to use Astra Linux for organization: we will explain how to install and configure 1C and also review the configuration of servers based on the Astra Linux distribution. Numerous examples and assignments for self-completion are provided for better material consolidation.