Most of my HTML/CSS skills were formed when these things did not have good built-in solutions.

As someone who just wants to hack together a responsive blog that looks nice, the things that are now “simpler and easier in the long run” have not been easy or obvious to come by when looking for resources, and while I’d love a deep knowledge of CSS, the investment in time doesn’t make sense given my use case. This is why I gravitated to Tailwind - learn the conventions of the utility classes (only took a few minutes) and the rest mostly just works.

I’d love something like http://vanilla-js.com/ but for modern CSS. Something that paints a crystal clear picture about what can be done, and how to do it without bringing in $framework.