I'm in the process of writing a book, Beginning CI/CD, primarily because I have a strange way of learning things, and hoping others might find my teaching style useful. I also struggled with CI/CD and still have those struggles fresh in my mind.
While the author of the article is against commercial publishers, I don't think I'll have the same impact if I were to go with the self-publishing route. Either way it's super unlikely I'll make a profit so it might be better to use it as leverage; also, getting a publisher to publish it shows that there is at least some commercial viability.
Looking for beta readers--if interested, feel free to reply or email me (email on profile.)