Sorry, I meant 8 chapters. I read through the 34 lessons. I suggest you take a look at typingclub. 700+ lessons free of charge. Repetition, and metrics are the selling point. If you incorporate that model in vimified I think you’ll have way wider adoption.
After reading Practical Vim by Drew Neil I went to his site to check out what else he has. Well he's selling a course that looked like the majority of what he's covered in the book. When I saw the $150 price tag I couldn't believe my eyes.
I left the site and bought his other Vim book instead.
There are actually 34 lessons right now (you can see the lessons if you click on the chapters to expand them).
Please let me know if there are topics that you want to see, I wanna add what people want to learn!