I would encourage you to do so, but perhaps you should not start with one of these Sears catalogues
I bought such a compendium myself, and it sure is a valuable read. But using it to learn how to edit photos with Photoshop is kind of like trying to learn how to drive by reading the manual of a car.
Thus, I'd recommend to buy a book that focuses on photo editing. The Photoshop compendium would be an add-on then, to learn more about the functions, once you know when and how to use them.