I recommend www.css-tricks.com as a high-quality learning resource. For structuring CSS (its cascading nature requires a lot of discipline esp. on larger proje

I recommend www.css-tricks.com as a high-quality learning resource. For structuring CSS (its cascading nature requires a lot of discipline esp. on larger projects) I recommend looking into BEM and SMACSS approaches. If you choose to use CSS for layout, I recommend Susy grids v.2 — look up the Youtube of videos creating different responsive layouts with it. Really fantastic and a time saver. If you’re designing only for the latest browsers, look into CSS grid and flex box. I recommend using the SCSS preprocessor — dry your code with variables and mixins, simplify complex calculations, manipulate color easily, incorporate a layout calculation framework like Susy etc. CSS is powerful, complex and has variable compatibility across browsers. This means a lot of attention to detail and a good amount of hours solving edge cases. Good luck!