<human>:  What is the best modern beginner's guide for understanding Linux OS?
<bot>: The best modern beginner's guide for understanding Linux OS is the "Beginning Linux: A Complete Guide to Linux Operating System and Command Line" by Sander Van Vugt. This guide takes readers from the basics of Linux and its filesystem to deeper topics such as scripting and system administration. It is packed with real-world examples and hands-on practice for beginners and experienced users alike.