For my money nothing beats EB Garamond [1] and Robin Williams' (not him) books on design [2]. "The Non-Designer’s Design Book", "The Non-Designer's Type Book", and "The Non-Designer’s Web Book" especially. (You might have heard of "The Mac is not a typewriter"? She's the author.)

[1] http://www.georgduffner.at/ebgaramond/ https://fonts.google.com/specimen/EB+Garamond

[2] http://www.ratz.com/robin/books.html