This document provides a short introduction to Linux operating systems and networking. It defines what an operating system is and its responsibilities in managing computer hardware, memory, processes, and security. It explains that Linux is an open source kernel, not a full operating system, and that distributions like Red Hat are operating systems based on the Linux kernel. It gives a brief history of Unix, Linux, and important developers like Linus Torvalds, Richard Stallman, and Mark Shuttleworth. Finally, it discusses some basics of installing Linux, booting from a USB drive, and using command line tools like nmcli for network configuration in Linux.