DonbunEf7

So my friend, who is the opposite of "techie" asked me to teach him Web Programming and so I did. He's able to code a decent static website by himself (didn't teach him Javascript or any other server side language) after about 2 weeks of daily lessons. When I was thinking of ways to teach him I thought of spaced repetition, which I recall is used for behaviors and language learning as well.

He and other friends told me to write a book using the same method, but I'm skeptical that people would be interested. So, before hiring an editor and trying to write it down, do you think it's worth to write a book with "my method" or if there are already books like these on the market?