Modern CSS has numerous tools to help you improve the legibility of your text, from cutting edge technologies like variable fonts, to newly precise control of established properties. Edoardo Cavazza introduces some of his favorite tricks, with plenty of actionable tips for implementing them on your own sites.
The grid system is an aid, not a guarantee. It permits a number of possible uses and each designer can look for a solution appropriate to his personal style. But one must learn how to use the grid; it is an art that requires practice.