It's a Book by Lane Smith is a children's story at first glance. It's about a clueless creature who can't seem to figure out that a book can't text, scroll, or need charging. A monkey tries to show him how to use it, with little success, until he finally sits down and reads it for several hours. Even then, he doesn't quite understand.
This is probably my favorite younger book, though the ending isn't one most parents would want their 6-year old to read. When the monkey loses his patience is my favorite part, though I'm not giving anything away. You'll have to read it yourself to find out.