I got a free month with getting my DD a fire for her b-day and she wants to download everything that says Prime free but I think I heard it is only like 1 book a month. Not sure of the movies/tv shows. She tells me one thing but I dont want ot get stuck with a HUGE bill till I can figure it out. I know shipping is free with Prime but what about the other thigns? Can I get the easy to understand version and not the legal version? HELP!