I agree this would be awesome - and kind of relates to another suggestion I opened (have all terminal commands saved as an .exs file per chapter: Suggestion: .exs scripts for all CLI commands per chapter in source code .zip).
Maybe just a topic here on DevTalks per chapter would be nice - there’s 13 chapters, so it’d be quite a few posts… but the answers of each chapter should definitely exist on their own forum IMO.
When I have figured out mine for chapter 3, I’m happy to share it. Without any other answers/discussion I got stuck, and had to open a question topic on it 
.