Anyone have favorite resources for modern vanilla (no piles of libraries, middleware, etc) Javascript / HTML / CSS techniques? Nice solid overviews, references, or cookbooks a plus. CSS, in particular, I've never fully wrapped my head around all the flexbox, grid, etc layout stuff.

I'm, against my better judgement, doing a bit of web app development, and actually having fun, but Search is Crap nowadays and pointers to modern resources would be handy.

Thanks!