This book serves as an introduction to computer hardware and software, aimed towards people with an interest in troubleshooting and optimizing their computers. We go in depth into different types of hardware components and how they interact, common hardware problems and how to analyse and correct them, common software systems, and how to maintain them, and finish covering the basics of computer networking. Written by a former Peace Corps Volunteer's educational notes, this book great introduction to computer technicians or those who want to learn more about how their computer works.