It's helpful to have a basic conception of what the fundamental force of the universe is, so M-theory/string theory is a good start, even though it is far from complete. Additionally, I would recommend understanding what color is, so the Young-Helmholtz theory of additive color is helpful since it is utilized to organize the images you are looking at right now. Also, knowing about the Theory of General Relativity, doesn't hurt either, because it allows us to think beyond just a three dimensional framework of reality, which broadens our minds and imaginations. So, in other words, it's good to know of most of the big theories in the physical sciences. When we approach the social sciences, ideas become less rigid, and no theory really has intrinsic superiority. But, above all else and all theories, just approach everything in life without a conviction that you are able to fully understand it, because at the foundations of the world, our perception and knowledge falls apart. We can certainly compartmentalize a lot of subsets of groups of information, but we can never know it all. We are far too limited.
