This doesn’t seem like a very long book.

It isn’t.  I could have added a couple of pages of fluff to each chapter, but that wouldn’t help you improve your tips.  I kept it brief so you can get the information you need and start applying it.  If it was 300 or 400 pages, it would be much less likely to be read.  This book only helps if you read and apply it.  Keeping it short is the most effective method I could think of to allow that to happen.