Tim O'Reilly: "The web has changed the nature of how we read and learn. Most books still use the old model of a sustained narrative as their organizational principle. Here, we've used a web-like model of standalone pages, each of which can be read alone (or at most in a group of two or three), to impart key points, highlight interesting techniques or the best applications for a given task. Because the basics are so easy, there's no need to repeat them, as so many technical books do. Instead, we can rely on the reader to provide (much of) the implicit narrative framework, and jump right to points that they might not have thought about."