Just published an updated version of my book, OAuth 2.0 Simplified! I also made a new book, The Little Book of OAuth RFCs, a collection of all the specs which are a part of OAuth. If at least one person appreciates the contrast between the sizes of these two books, I will be happy.
You can find both at https://oauth2simplified.com
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@aaronpk what do those books teach the reader to do?