This book, which is aimed at students, covers only the pre-production stages of animation. That said, I'd recommend it to anyone interested in the subject including those like myself who are merely enthusiastic fans.
If you want to understand more about how animators work and the skill involved in creating successful films then there's a wealth of insight here. Nancy Beiman has worked as a professional animator at the Disney studios and elsewhere for many years and what's presented here is hard-won through experience, not acquired second-hand. It's copiously and entertainingly illustrated with examples taken from both CGI and hand-drawn productions.
I'd expect anyone interested in the subject at whatever level to get something from this book, and I heartily recommend it.