Acoustic treatment is an art and a science. Their is much ground to cover once we meander a bit deeper than the basics of treating your home or project recording studio to record a decent vocal take, or isolate an acoustic guitar.
From diffusors to absorbers and bass traps to room modes, there are few authorities, if ANY that boast a deeper knowledge, experience, and respect as Ethan Winer.
Here is one of the best, and most comprehensive articles on acoustic treatment principles and theory for the home and pro studio.