Hi! You've got some extra text in the url and it gives 404.
I’m trying to change it but apparently it’s not possible to adjust URLs after submission?
Hoping one of the mods could help with this!
Btw, for a Show HN that's a book, the convention is to provide a sample chapter (or something similar) for free. Otherwise there's no way for users to "try it out", which is the necessary condition for a Show HN: https://news.ycombinator.com/showhn.html.