This is a good book for drawers. It is a book devoted to people with good drawing skills who want to learn 2D animation, in the "old" style, that is, by drawing with pencil. The book is focused on hand drawing, not directed to computer animation with 2D or 3D tools, although its teaching is applicable for any process.
"Animation" is clearly writen by an animator to beginers animators. The book is a well organized mini course on animation. The final art is superb, the sketches are very good. The author is also a good teacher. Most of the Principles of Animation are covered, and it has the right tutorials on momentum, acceleration, walking and run cycles. It has a chapter with great directions on production, work organization, scheduling, budgeting, which are aspects sometimes neglected but of importance for a successful work.