Butterick's Practical Typography[1] is free online and a really good read. To go beyond just one book there are good posts and book recommendations on Typekit

Butterick's Practical Typography[1] is free online and a really good read. To go beyond just one book there are good posts and book recommendations on Typekit Practice[2]. [1]:http://practicaltypography.com/ http://practicaltypography.com/ [2]:http://practice.typekit.com/ http://practice.typekit.com/