I realize it is hard to believe but someday (soon) your child might be dealing with all things Internet that are beyond your understanding.
It is about how to navigate the complex and connected world of your kids.
And it is a free-book-and-buy-it-if-you-
like-it... And even an audio version!
Cory Doctorow said "the best book about young people and the Internet I've read to date"
You might have heard about it on NPR (link).