I understand everything in the world to the deepest depth.

Let me explain, because this is a bit of sarcasm. I realized after years of being a specialist, that deep knowledge can be hired for at a price much less than the cost of achieving it in most cases. Thus, in most cases, specialized knowledge isn't needed - but in the case it is, find and talk to the person who can get you most of the way there.

However, in the spirit of the question, some CS related algo's or quantum mechanics (due to PBS Spacetime). I've learned to be a flexible generalist.