Where can we store a list of questions that are considered canonical?
Canonical means that it's asked frequently enough to warrant an excellent clear and detailed answer that the site edits and maintains so that it's broad, clear and helps many people troubleshoot or solve a common issue or misunderstanding.
Rather than blame people for coming and asking the same question over and over, the intent is to organize and realize that this will never and and instead have an efficient manner to link these to canonical answers.
That way, if the new asker actually has a different question, it will be easier for them to edit the post and get it reopened. It also will signal to the community that the answers are going to be heavily used and that it's worth it to keep them current, clear, and exemplary so that they can shoulder the burden of answering many questions on the same core topic.