I’ve been working in HTML for 25 years. Last year I really sat down and become extremely familiar with Bootstrap 4.
Styling is easily my strongest skill. This is traditionally what I am recruited for. If I can, I spend most of my time using LESS for mixins, variables, nesting and guards. I haven’t used SASS as much but functionally there’s a lot of similarities between them that I wouldn’t have too much trouble switching if I need to.