A printed book has the advantage of establishing a clear order for its pages. Here, most pages have a page listing to the right to help you navigate a group of related pages. (Clicking on the title bar at the top of the page generally moves you to a higher level page.)
The page listing to the right is an example. "Supply vs. Demand" is a "features chart" for classical and Keynesian models. "Whose models are these?" sets the record straight on that point. "A Brief Chronology" sketches a timeline for the various macro models.
The "Welcome" page is a good entry page for external citations. You might want to bookmark the "Table of Contents" page.