Even in programming, writing a program is not the only way to make. Writing a blog article is another way of making. For example, if you learn something new, let's explain it to yourself of yesterday. You may find ambiguous points of your understanding.

It is also nice to tell others what you learned. By watching the others' face, you can know whether your explanation is helpful. If they misunderstand what you said or ask irrelevant questions, it means that you did not explain well. It is a verification. By turning the refining cycle of the explanation, you can deepen your understanding.