Butterick’s Practical Typography is insightful as well as opinionated. You’ll learn the difference between straight and curly quotes as well as to stay away from bad fonts (in his opinion). Obviously if you use his fonts (Equity and Concourse), you can’t go wrong. The book is a great read and I love the way Butterick uses the web as a publishing platform. The book is set in the beautiful Equity and Concourse. Unfortunately the site is not made for mobile. Reading the book on the iPhone is a bit of a pain because the text is tiny and you have to move the body text around a bit to fit nicely on the small screen. Taking the responsive design approach would have solved these issues.