The workbooks are possibly useful given that there is little else in the market for 'instructional' books, as compared with applications such as Adobe Photoshop. The Affinity books are also very expensive, I have personally baulked at purchasing them for this alone. One has to ask why they are not provided as a PDF at a much reduced price as an alternative. A book that contains comprehensive instructions for Affinity Publisher is some thing I have yet to find, you can locate various YouTube videos for Publisher but they are fragmented and in some instances assume a degree of knowledge beforehand, so not good for someone starting out and wanting to learn the application to a more advanced level.