These are really good advance chess books.
Chess Strategy for Club Players by Grooten
Mastering Chess Strategy by Hellsten
How To Play Chess Endgames by Muller
That endgame book my Muller is a strategic endgame book. You will leanr how to handle many strategic endgame positions.
To really get the benefits from these books, you must play all tha games in a real chess board or online board.
I believe in books in a way that one can learn 100s ideas/techs which is not possible in 100 articles or GM videos because of unavailability. Also digital books can be carried in phone and read in convenience. So Any one suggest some Advanced chess books plz, I already read watson's chess strategy in action... and nunn's some advanced books...