Dr. Mazhar Al-Ani's 2020 publication, 'Fundamentals of Operating Systems,' provides a comprehensive introduction to the core principles governing modern computing. This essential textbook is meticulously designed for students and aspiring professionals, systematically exploring key topics like process management, memory allocation strategies, file system structures, I/O handling, and system security. Through clear explanations and practical examples, readers will build a solid understanding of how operating systems act as the vital intermediary between hardware and software, making it an indispensable resource for mastering foundational concepts in computer science.