This is a bold claim, but i stand be­hind it: if you learn and fol­low these five ty­pog­ra­phy rules, you will be a bet­ter ty­pog­ra­ph­er than 95% of pro­fes­sion­al writ­ers and 70% of pro­fes­sion­al de­sign­ers.
Typography in Ten Minutes is but one resource in the embarrassment of riches that is Matthew Butterick’s Pratical Typograpy. Butterick is my kind of person: he cares passionately about his craft and isn’t afraid to ruffle feathers. I can’t recommend Practical Typography enough for anyone who cares about typography (or who doesn’t yet).