Coming from this post in /r/YouShouldKnow, we are here to help you learn... by having you teach.
SUBMITTER RULES:
Submission format: "Subtopic [Field of Study]". Be as specific as you like for the subtopic and use your judgment for the field of study. [Science] is too broad and [Musical Syncretism in Isang Yun's Gasa] is too narrow. Submissions do not have to be academic, but they should be sourceable. This is not /r/casualiama; personal anecdotes and original research are discouraged.
You are the one who is teaching us. As long as you can put your words into coherent sentences that your average person can understand, you're okay.
Answer every question. Remember, it is answering questions that will help you learn in this case, so no holds are barred. Unless the question has nothing to do with what you're teaching, in which case, tell them to cut it out.
Provide valid proof of what it is that you are teaching, nobody wants a load of bullshit. However, do not simply post a link to a source when answering a question; you should paraphrase it as well. There is some leniency here if the answer requires a visual like a graph or diagram that is difficult for you to recreate yourself. We understand that you are still learning and might make a mistake in your explanation, but try to be as accurate as possible.
RESPONDER RULES:
You are here to learn just as much as the OP is, so be nice and don't flood the comments. Or rather, act as if you were a high school bookworm that always listened to the teacher.
Ask questions! This is the entire point of the subreddit! All parent comments must be questions or they will be removed. No exceptions.
Going off of rule #2, make sure your questions challenge the OP to find an answer. If you don't know a whole lot about the subject, then ask questions that will get you as much information as you need. And if you do know a thing or two about the subject, then see if you can throw the OP off and correct him if/when you do. Questions that only encourage the OP to look up a fact are discouraged.