Inspired by: Help the helpless with how-to-ask tag tips
It seems this hasn't been proposed on this site yet, so here goes...
We could consider adding tag-specific messages that pop-up when you try to post a question with a particular tag. For example, when using a more general tag like calculus, it could prompt you to consider adding more specific tags with a list of similar tags. For tags that get high percentages of questions that end up closed, we could link them to the How to ask a good question.
Not every tag needs one, but it might be a nice feature to have anyways.