If you can find a copy, check David Vestal's Craft of Photography (1978), and the followup, The Art of Black and White Enlarging (1984). Both from a time when enlarging and printing were BIG things. Hard to find (?) but very much worth it. Not just mashups of older books reformatted into modern trendy colourful picture laden tomes.
(just my 2 cents worth...)
After reading many, many others, Vestal's "The Craft of Photography" was the book that finally made it clear to me. Highly recommended.