As noted, the title is very misleading; maybe it should have been called "how to tie the most useful flies in your box in the most efficent way".
Like most tyers, I have dozens of books; there's Marinaro, Kauffman, Proper, and on and on, but this one book probably taught me more about how to actually tie than any other book. Best is a production tyer, but the same techniques he uses to tie a hundred dozen of some pattern are just as useful for the fisherman who needs a dozen assorted flies for a weekend trip.
The descriptions are marvelously clear and the photos reveal every detail. This book and a good vise are probably the first two things a beginner should buy.