Hi,
I have a couple ideas for organizing our tutorials more clearly:

- each tutorial should have a "headline" statement that summarizes  
what skill(s) the reader will learn, and what it assumes they already  
know (with links to more basic tutorials that teach those more basic  
skills).  That way, a reader should be able to figure out immediately  
which tutorial genuinely fits his / her goals.

- I notice a general pattern in our tutorials, of two fundamentally  
different kinds of material
   * using Pygr with existing databases, i.e. how to "plug in"  
existing databases so Pygr can access them
   * using Pygr to create your own databases.  (this material really  
needs to be expanded, because in the past I often assumed that readers  
already had their own databases, and just wanted to plug them in to  
Pygr).

This subdivision of two themes is present in nearly all our  
tutorials.  For example, part of the worldbase tutorial describes  
using worldbase to access various datasets, whereas another part  
explains how to add your own datasets to worldbase.  I propose  
breaking this into two separate, shorter tutorials (linked to each  
other, of course), so it's easier for users to see what skills are  
covered where, and to quickly find the tutorial that covers what they  
want to learn at any given moment.

What do other people think?

-- Chris


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