The book "Simplified Design - Reinforced Concrete Buildings of Moderate Size and Height, Third Edition" explains how the ACI 318 standard is used for designing reinforced concrete buildings. It covers buildings of all sizes and shapes, from single-story to high-rise structures. The book focuses on simplifying the design process for moderate-sized buildings, introducing new seismic design provisions and other changes. The goal is to help experienced professionals streamline their design procedures and stay updated on the latest standards in the industry.