Best books for middlegame play around different pawn structures.



I agree. I would highly recommend this book by Mauricio Flores Rios. It's an improvement over Soltis' Pawn Structure Chess, which I recommend as a supplement as it contains lots of example games illustrating the major opening pawn structures.
https://www.amazon.com/Chess-Structures-Mauricio-Flores-Rios/dp/1784830003/ref=sr_1_2?crid=1Q3FRTU8KMWIA&keywords=chess+structures+a+grandmaster+guide&qid=1636608976&qsid=144-4486492-1814835&s=books&sprefix=chess+structure%2Cstripbooks%2C222&sr=1-2&sres=1784830003%2CB01FF36ZZU%2C151886046X%2CB091HBKN28%2C1849940703%2C9056916319%2C1074770331%2C0671659723%2CB09GTFQ8CC%2CB09JBPNHBH%2CB09F16LK6Q%2CB09JJ9DJVY%2CB09JJ98H9L%2CB09JJGQNTY%2CB09F14TDMF%2CB0858TTK4K&srpt=ABIS_BOOK
https://www.qualitychess.co.uk/ebooks/Flores_Rios_Chess_Structures-excerpt.pdf


Good Chess Books for Beginners and Beyond...
https://www.chess.com/blog/RussBell/good-chess-books-for-beginners-and-beyond