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Re:Racket v7.2 by ssivark on Thursday January 31, 2019 @12:43PM (#19046787)
Check out "How to design programs" (the second edition is said to contain significant improvements). Book is available for free online.

It's discussed once every while on HN: https://hn.algolia.com/?q=htdp

Re:Racket v7.2 by DonaldPShimoda on Thursday January 31, 2019 @01:42PM (#19047461)
Link to the book directly is: https://htdp.org