> My point is: just because a book has cartoons & unserious style doesn't mean it has good presentation of teaching. It might be a suboptimal book that just happened to use cartoons.I hope you're not implying that I don't have good presentation or don't teach well! I'd obviously disagree with that. And I definitely think that the Head First books mentioned by others in their responses do a great job with both.
But I notice that you said "suboptimal," and then made this point:
> - page 1: the clipart of the man and woman and the thought bubbles do not reward the user with quality knowledge in relation to the space they take up
I recommend against judging the "optimality" of a book based on the amount of information that it packs into the smallest amount of space. Maybe instead of the amount of space taken up by the teaching, consider using the amount of time and effort required by the reader. Pages are cheap, especially in an electronic medium. A page like the one you mentioned is really quick to read and absorb.
Also:
> - page 19: the clipart of the tourist with the arrows and thought bubble does not actually teach a networking concept
I haven't read Head First Networking, and I don't know the authors, Al Anderson or Ryan Benedetti. But from a quick read, it's clear that that picture is part of a larger story (in this case, about tourists and an airline) that the authors are using as a teaching tool. Stories are a very effective teaching tool.
This should make sense if you think about it. Think about the last textbook that you read. Can you remember the major points that it made, in order? You might be able to, but most people probably can't do it accurately. Now think about the last movie you watched. It's much more likely that you can remember most or all of the major plot points and in the right order, because they're part of a consistent story.
Our brains are wired to remember stories, just like they're wired to remember places, faces, and emotions. The Head First books use stories to take advantage of this effect, not dissimilar to how people use memory palaces (https://news.ycombinator.com/item?id=2395739) to improve their recall.
Yes, telling stories (especially visually) takes a lot of page space. But readers absorb them quickly -- in my experience, it's a very efficient and effective way of teaching. The Head First books that I've read (and hopefully the ones that I've written!) do a great job of that.