The book description (both online and physical) offers this as a guide to data, and that's exactly what it is. By presenting so many examples, from murder to MP's money to multiculturalism, the author gives you the chance to question whether patterns exist and, if they do, learn how you can find and show them.
It's true, the book doesn't give you a step-by-step guide to how to make a bar graph but that's what makes it so great. At least half of the book's 311 pages are printed with graphics that change the way we think about communicating complex information. And that's actually the first step in the real 'how to'. Because if you don't take the time to stop and think about what you want to say and how you want to say it, you won't get very far learning about data.
Note: I know the author but I'm not obliged to say nice things as we no longer work together - every word is sincere, buy the book and see for yourself!