Don't be an idiot - Idiots repeat as for my opinion to repeat is a useless process better check out one book it's not possible to learn everything and use everything it's insane. But you can do one thing, focus on the important stuff which have impressed you, use them - delete the book, make an essay and think on this few days you can think and check out some other books, videos and so on and so on... If you didn't get it, okay then listen again until you get it... It's imporntant to don't repeat and to understand it!