<p>I agree with <em>Larry Wang</em> and I want to add my two cents. As Larry noticed, to search something you need to know its name. You need to have access to the appropriate sources (e.g. textbooks). Yes, there is Wikipedia, but since almost everything nowadays is already covered to some extent on Wikipedia does it make literally any question invalid and too obvious? Sometimes Wikipedia articles are not clear or low quality. Sometimes even if you find relevant resources on the web you may need them to be explained to you in different words.</p>

<p>You don't need to upvote such questions (you may downvote if you really consider them too obvious) and you don't have to answer them. However if something is unclear for someone and there is a person willing to answer, then it seems that this site was created for exactly such a case. </p>

<p>Moreover, even if we closed such questions this would not lead to OPs learning the answers (unless provided as comments, but then why not post as answers?). If we close such questions, then new questions will appear (I strongly believe that the probability of basic questions appearing again is greater than in case of hard questions), so we would close them over and over again rather than posting a single answer that can be searched. Or in the worst case, we can close those questions as duplicates, so to make searching easier in the future.</p>
