There is some good Wordpress-specific technical advice in the book. But it’s discouraging if you’re using another platform like Blogger instead. I gave up on chapters 3 and 4 (all of the technical advice on setup and SEO etc) because it seems that I need to be using Wordpress to get full value, or at least I don’t have enough patience to keep reading and looking for something that will work for my platform. Maybe this will be less discouraging in the final version with a good index to make it easier to find Blogger-specific information.
It might be useful to have a section on how to move from Blogger (and maybe any other major blogging platforms) to Wordpress. And what you would lose by doing this (broken links etc). I don’t think I would bother doing this myself, but it might let other people get more value from your book.