I have never used Bootstrap, Material or any other css framework of any sort because I really wanted to overcome the confusion that came with getting started with CSS, and I am very glad I did because styling is one of my favourite parts of developing now. Once I got a solid grip on positioning things started to make way more sense, and now I am very comfortable with building layouts and animations with css and love experimenting with some of the lesser known features to see what I can come up with. I've done things with nested 3D transforms, blend modes, SVG filters, and a whole bunch of other stuff. I think design is something that is heavily underappreciated, and honestly believe that a functional, and captivating UI is just as important as performance. Right now I do all my own design, but would love to have designers around me to work with because I know how much thought actually goes into to functional and effective design, and that's something I would love to learn more about.

Sass has been my standard setup in terms of preprocessing mostly just because I prefer the syntax, and find that I can organize my stylesheets better by splitting out styles for specific behaviors, or even base styles out into mixins/extends and use a number of utility stylesheets that allow my actual styles to be way cleaner. In terms of methodology I really like doing locally scoped styles using modules just because I like not having to worry about name conflicts, and I still get the separation of concerns unlike using a styled-component approach. I have also used BEM in the past and am flexible in that regard.