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I haven’t seen anyone mention another reason to answer your own questions.

I wish I knew a more scientific or technical term for it, but it’s commonly called the [Rubber Duck principle](https://en.m.wikipedia.org/wiki/Rubber_duck_debugging), and I utterly swear by it. 

The idea that engaging in dialogue with interlocutors is profoundly beneficial to clarifying and developing one’s own thinking goes back to at least Socrates, yet is surely perennial wisdom.

Question-and-answer forums like Codidact give you the opportunity to externalize your questions to an audience - which allows you sometimes to make progress on them yourself. It’s sort of like a public declaration of a research to-do, or, throwing a ball up in the air, only to catch it yourself.

I personally believe I have learned more of intellectual worth, and grown more, having interlocutors - oftentimes, myself - on forums like Stack Exchange, than I did in university. I believe this strongly, in fact.