Most of my notes in this book are simply pointing out where certain tables or information is located, and are not actually related to things which I learnt or questions I have. The book does really good at teaching and laying out the information which it is delivering. I bought this book as a tool to compliment my worldbuilding, and it has served that purpose well.
Also found a factoid in the book that seemed false and had no source attributed. I emailed the author and heard back from them a while later, they were also unable to find the source but said they would reach out if they did—I am yet to hear back from them.