I once took a look at a dog training book - to see what was out there as I was running a pet training business. I went to the "chapter" on teaching a dog to sit. It was two pages with lots of nice pictures of happy dogs sitting with only one line of instruction: "Tell your dog to 'sit' in a firm voice. When he does, give him a reward."
?!!?!?!?!? If that works your dog already knew how to sit!
While that is one of the worst training books I have ever seen, most are only slightly better.
Often they are dressed up with and couched in a bunch of foofy language about building a relationship, and trust, etc etc. Important points no doubt - but there are no actual *instructions* anywhere to be found.
Its a bit like a users manual for a DVD player that has ten pages on how much you'll love watching movies, and describing all the different genres of movies .... but it never tell you how to use your dvd player.