I find it difficult to navigate.  There are just so many pages and you cannot pick a selection by clicking on a table of contents.  The book I started was Roughing It.  It has pages of chapter listings in the Table of Contents before you get to the actual book and you have to advance page by page through the table to get to Chapter 1.  Sometimes I found myself in another book instead of another page. (Have not figured that out yet but will work on it.)