I'm glad to see mathematics guides, social leaders, and research papers included in this list. It's one thing to google "nlp tutorial" but another to know who to follow and even where to find more advanced content.
I'm a neophyte to ML, but one course I very much enjoyed auditing was "Learning from Data" [1] taught by Caltech Professor Yaser Abu-Mostafa. I found concept of the _Learning Model_ particularly fresh representation of the ML activity (starting at 14:39 in the first video linked here [2])