Mr X really relates to everyday people in this truly informative and exceedingly helpful book.
--- What does it mean that "he relates to everyday people"?
That is marketing language. The writer is trying to make Mr. X sound like he isn't like those other mean old MDs who think they're better than you are just because they went to school for eight years and survived a harsh weeding-out process to prove their dedication and intelligence.
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That is marketing language. The writer is trying to make Mr. X sound like he isn't like those other mean old MDs who think they're better than you are just because they went to school for eight years and survived a harsh weeding-out process to prove their dedication and intelligence. "Relate" is practically meaningless in this context, but look up the intransitive verb and make a mish-mash of