I know what subjects I know about and what kinds of things. So if some interesting question arises and I know how to solve it, I often write about it. I do it with a detailed way of looking at the subjects in my picture of the world, so that as I proceed it becomes an advice on how to learn such skill. Sometimes I need to start with an explanation of how the subject came to my mind and what the approach is, and so it kind of softens the text's beginning to story like.
About my texts and me as a writer. And about my upbringing's effect on my thinking skills. (My other texts, for example learntalents.blogspot.com , tell more of my choices of values and good ways of doing etc.)