codedrivendev

I know others have already mentioned it, but i've recommended https://flexboxfroggy.com/ to others before and they quickly picked it up.

This is another good one for learning css grid https://cssgridgarden.com/

I was wondering why so many links very recently on reddit/HN were showing errors...

https://frontendmasters.com/ and https://egghead.io/ are both quite cheap & have lots of courses - especially useful if learning a new framework or library that they cover.

I think I prefer the recent CAPTCHAs (where you solve a puzzle by rotating an item, or finding the matching item). The older ones from years ago (deciphering mangled text and trying to work out if it is an `i`, `1` or `l` were more annoying)