To begin, the book covers the fundamentals of SwiftUI and its core functionalities and how to write UI without having to worry much about it. It explains the fundamental Swift syntax, data types, control statements, functions, classes, and structures, as well as methods, protocols, and closures. The book covers expert tips for adding animations with a single line of code, as well as some SwiftUI transitions. Then, through a dissection of an iOS application, it teaches how to create APIs and implement API calls. It also covers widgets, App Clip development, web banner creation, and how the app communicates with the App Clip.