Good Chess Books

Simple Chess: A great explanation of strategy, making it very easy to understand. You have it on YT as well: https://www.youtube.com/playlist?list=PLUrgfsyInqNbkyiwPSSBQ6ALkkccKItPE
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I am currently not able to decide which books to read and buy. I am not an expert player but I know all the concepts and strategy.I am mainly looking for books that help my middlegame play.
Please suggest books you have read which gave you a significant boost in your middlegame play.Thank You!