For me blogging acts as a function to learn about something. If I want to understand a particular subject (albeit a small one), I’ll write about it. Do some research on the matter, think over what I am trying to answer, and at the end I always feel more knowledgeable about that particular subject point. Another factor is that it improves my writing, which in turns helps expression which too is very valuable. Sure not many people read it, but honestly putting on some music and just tapping away on something interesting is quite therapeutic.