Related, I just found out that Darcy Clarke put this list together of good front-end interview questions. I would have included it in the article if I'd known about it ahead of time.
https://github.com/darcyclarke/Front-end-Developer-Interview...
https://github.com/darcyclarke/Front-end-Developer-Interview...
I think I see what she did there..
I remember coming across this other "Learn Front-end" list: https://github.com/dypsilon/frontend-dev-bookmarks on HN a little while ago and thought it was a great example of just how scattered Web-FE education still is. Everyone has their own favorite "book" and there's no K&R that you just pick up and read.