My problem is I thoroughly learned HTML and CSS twenty years ago and am only incidentally aware of how they have changed and improved since. (I'm mostly a backe

My problem is I thoroughly learned HTML and CSS twenty years ago and am only incidentally aware of how they have changed and improved since. (I'm mostly a backend programmer with some frontend skills. I work with another programmer who is the other way around. I also learnt during the time when new features to the specs moved into browsers at a glacial pace, making them hardly worth keeping up with.) For example I was spinning up a new project and added SASS so I could do nesting to make things cleaner. My frontend counterpart pointed out that CSS already has that. Anyone know of some good resources that would bring my knowledge up to date without trying to take me through first principles?