This article is for anyone who works with typography, in any medium, and it is especially for those designers who are keen to give users the best reading experience possible. Jeffrey Zeldman once said: “90% of design is typography. And the other 90% is whitespace.” You might be knowledgeable about typefaces; you might regularly modify the leading, tracking, and kerning of your fonts; you might optimize the file sizes of your web fonts — but is that all that can be done?

https://www.smashingmagazine.com/2020/05/micro-typography-space-kern-punctuation-marks-symbols/