learning while getting your PhD is maybe 1/10 learning from classes and 9/10 creating new knowledge and reading papers; I think I am being generous to classes h

learning while getting your PhD is maybe 1/10 learning from classes and 9/10 creating new knowledge and reading papers; I think I am being generous to classes here. You become the world expert by going extremely deep in a very narrow topic and actually creating the knowledge around the topic. You don't need to be a PhD candidate to do this. For credibility, I was a Computer Science PhD candidate 4 years ago.