This document provides an introduction to Linux, the LAMP stack, and careers in free and open source software (FOSS). It defines FOSS as software that is free as in free speech and open as in open code. It then introduces Linux as a free, open source, virus-free, and secure operating system supported by a large community. The document defines LAMP as a FOSS solution combining the Linux operating system, the Apache web server, MySQL database, and PHP scripting language. It provides brief overviews of each component and examples of their use. Finally, it discusses career opportunities in FOSS such as internships through programs like Google Summer of Code and jobs at