I found out that what works best for me is finding MOOC-style course centered on one topic/ technology which is prepared by insiders and takes bunch of days to go through. Or like one hour long youtube videos or long YT playlists are also great when well prepared. Anyway I cant really find any free course, youtube resources or anything similar to really advance my CSS knowledge. Does anyone have some tips?
(I find W3Schools too beginner level and MDN too uncomfortable and too scattered for effective learning.)