YMMV of course but, in my experience these light-hearted free books are better than the For Dummies books, which are also for-profit, and tend to feel factory-c

YMMV of course but, in my experience these light-hearted free books are better than the For Dummies books, which are also for-profit, and tend to feel factory-churned. That being said, I've only skimmed one or two, and that was in high school. I feel like there is a difference in spirit and motivation which sets them apart.