@XanderHenderson I am a bit torn whether it is better to link directly to Approach0 or maybe to this answer. (The latter has an advantage that it has also some examples.)

Or possibly both links would be included?

I am mentioning this simply because it might be not immediately clear to a first-time user how to search in A0, this answer includes some examples and a bit more detailed explanation. (And also is a CW, so maybe it might be improved by the users who are willing to help.)

Of course, any place which has some additional explanation would work fine, too.

Question : "when I'm looking for a specific question" can I post a question here and request people to search for a duplicate? Or am I supposed to bring a candidate here and have people verify that it is indeed a candidate? Is this a P or an NP for duplicate finding?