I cannot tell You for documentation, but I can tell You data loader is covered in this resource
This is a good complement to the book on Absinthe
I was interested in GraphQL before Absinthe, so I started to do it with node.js first.
I do understand these are paid resources, and might suit all needs, but You can start by learning dataloader as an independant tool…
Starting by this will help You understand how to integrate it with Absinthe later.
If You have all your context queries ready, this will help You build a batch of queries, to execute as one.
Dataloader is a great tool 
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