I've ready lots of books on apartments and real estate. No one book is going to give you all the ins and outs. Best it can do is skim the surface and give you an idea of how things work.
If you really want to learn how to buy apartments, I'd recommend this group that took me from zero to 2000 apartment units: https://lifestylesunlimited.com/
@Bernadeau C. Are you looking to purchase smaller multi families of your own in your local market or is your goal to scale and do large multifamily a properties through syndication?