I recently asked this question, which I wanted to tag in such a way that would indicate it was a very basic question about simplifying an expression. Because of 6005's comment, I learnt about the algebra-precalculus tag. Can I edit this tag's wiki to indicate that the algebra-precalculus tag includes questions that are primarily about simplifying an expression? As it is, "other symbolic-manipulation topics" is quite non-specific.
I don't think I can delete the simplification tag that I created. Somebody else will have to.