In my opinion this is the best golf book ever written.
The late great Harvey Penick was the instructor at Austin Country Club for many years. Two of his biggest students were Ben Crenshaw and Tom Kite.
There isn’t any heavy instruction in The Little Red Book. It won’t tell you much about your grip or swing plane. It is simply notes/observations that Penick literally wrote down in a little red book that he kept for years. The book is completely blog like.