Great introduction to table views, web APIS, saving data, animation, concurrency and collection views (be sure to do the Fundamentals book first if you are new to Swift). Gives you a solid understanding of the key skills you need to build a modern app. That said, there are mistakes in code in several places. The most glaring is in the Dynamic Data section, page 600, where the example uses variables “itemsByInitialLetter” and “initialLetters” that have never been declared before in the sample code. Seems like they left a chunk from a section out of the book. Hope this will be fixed in future updates.