Book recommendation on zugzwang I am looking for a book recommendation on endgames. More specifically, I want to know how to avoid zugzwang, and what to do in case it arises.

If you know of any book which has in-depth case study on endgames which end up in zugzwang, please give a suggestion.
If you are in Zugzwang, by definition, there is nothing you can do, because any possible move leads to a disadvantage.

Most typically Zugzwang appears in endgames with few pieces, particularly in pawn only endgames where is is used as a very common technique. I believe that if you study pawn endgames you should encounter it very often and get very familiar with it, so that you can keep it at the back of your mind when doing calculations.

I would not focus my endgame on avoiding Zugzwang as there are usually other things to take into account as well.