"It’s a word we use to talk about how to make text comply with our style guide.... We address the reader as you — you can, next you do this — we don’t talk about we... We try to be funny, or at least lighthearted.... We don’t use future tense, we don’t use passive voice, we don’t have long chapters. A 26-page chapter is getting pretty long.”
Yeah. I agree. Keep it short. But write a lot: There are over 1,000 "For Dummies" titles, with 200 new ones coming out every year, and a list of "For Dummies" things that could be written that's too long ever to get through.
CORRECTION: 1,000, not 1,500 titles.