This well-written book covers all aspects of the Mac operating system from beginner to advanced. Starting with the very basics, early chapters cover the Mac desktop, windows, menus, files and mouse. Concepts are explained very clearly and illustrated by easy to follow diagrams.
Ideas are easy to understand for beginners and make a good review for users of all levels.
Interspersed with the old basics is some updated newer material such as contextual menus and spring-loaded windows. Behind the basics are often some explanations of how things work on a deeper level. The history behind some parts of the OS help it to make more sense. Nuggets of less well known information are thus found as pleasant surprises. The chapter on Control panels and extensions does a good job of explaining how these things work.