I think the breadth first approach is very important, it allows you to see the overall structure and focus your attention on what your interested in. Much like

I think the breadth first approach is very important, it allows you to see the overall structure and focus your attention on what your interested in. Much like a levels of detail on a map - first you need to know the big geography - where are the oceans/land, or in our case what are the most important events/people/locations/traditions, and then we can zoom until eventually we can see the details.