Chapter 1 through Chapter 6 provide the basic ideas that form the fundamental core of Ajax and building Ajax applications. This part of the book discusses the technologies and foundations that you will need to know before moving on to Ajax within applications and as components.
Chapter 1, Reinventing the Web
Chapter 2, From Web Sites to Web Applications
Chapter 3, Servers, Databases, and the Web
Chapter 4, Foundations: Scripting XML and JSON
Chapter 5, Manipulating the DOM
Chapter 6, Designing Ajax Interfaces