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I have tried mails to self and text files to keeping notes in one place, which I can reuse. However I have found them getting lost as time passes by. The "Anwser your own question" in stack exchange is good way of keeping notes to self. However if the question is simple e.g. "how to do something", stack exchange do not allow to post the question. I was wondering if there are guidelines to post simple questions with answer, which I and others can use.