I think theres is not enough of the understanding of what CSS is. And a lot of times trying to make "reusable CSS" is like trying to have make-up that is reusab

I think theres is not enough of the understanding of what CSS is. And a lot of times trying to make "reusable CSS" is like trying to have make-up that is reusable among many ladies. CSS is intended to be highly targeted and there are tons of "it depends" so the best you can do is to try and spend some time trying really understand CSS and what result you need. Writing CSS for widget is one thing, styling the page where every byte off HTML counts is another. Take any rules and advices with massive grain of salt, especially the moronic "no IDs allowed" kind ones. And yes, do use preprocessors.