This is Goldhe asks for a summary because he doesn't want to listen to a 90min video and your answer is for him to order and read a book?
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The quote is from the book description, and the book is by the video presenter about the subject of the video. So after taking a few seconds to read the quote, there is little need to watch the video or order the book unless one is really interested in the subject.

he asks for a summary because he doesn't want to listen to a 90min video and your answer is for him to order and read a book?