I write posts to organize my mental models of computer systems.
I want to build an understanding of the world. I think that is important and satisfying.
The point is not to understand all the details; one can never exhaust the world of knowledge. The point is to build some understanding, clarify my thoughts, describe the world as I know it, and expand upon it. Once I build a mental map of different things, I'll know where to dig into when I'm intrigued to learn more.