Thanks for the feedback! You are definitely right that there is a ton of material on this subject already out there. I intentionally chose a tiny subject I know a lot about that has mass appeal, so I could test the waters a bit. I have written more niche content on Crystal and also a few CS fundamentals focused articles. More niche content is planned as well as more mass appeal content until I get a feel for what the right focuses are.

My theory is that building an audience for a site like this is a mix of niche content and mass appeal content. I honestly have no idea what that mix is yet and what type of content to focus on, still figuring that out. Your feedback is massively appreciated! It will without a doubt influence the direction I take the site in!

As far as the value of this book over other resources, I would say the main separating factor is my writing style. If you like non-serious writing that leans much more towards helping you grok concepts than technical correctness then you will enjoy it. There is no stuff like "A monad is just a monoid in the category of endofunctors" to be found within my writing. Also there are lots of references :)

Thanks again for the feedback!