The Medium Design blog is a great resource if you want to unpick their design. They talk in great detail about the various typefaces they have chosen over the years, and why. https://medium.design/
Butterick’s Practical Typography is the best beginner's guide to type on the web that I know about. If you want to know how to lay out pages with good typography, this takes you through everything in easily digestible chapters. https://practicaltypography.com/
Butterick’s Practical Typography is the best beginner's guide to type on the web that I know about. If you want to know how to lay out pages with good typography, this takes you through everything in easily digestible chapters. https://practicaltypography.com/