Most chapters provide a short “postscript” that attempts to give some perspective on the information presented in the chapter. We do that with the realization that the information can be — and often is — daunting and will only be fully comprehended after doing exercises, reading further chapters (which apply the ideas of the chapter), and a later review. Don’t panic! Relax; this is natural and expected. You won’t become an expert in a day, but you can become a reasonably competent programmer as you work your way through the book. On the way, you’ll encounter much information, many examples, and many techniques that lots of programmers have found stimulating and fun.