Astronomy Stack Exchange has MathJax enabled, allowing us to use LaTeX to write equations. Like other SE sites with MathJax, we have a section in the editing help page on how to use LaTeX. This section contains a "MathJax help" link at the end.
By default, the link points to this page, but it turns the Community Team can change it to a different page, such as a post on our site's meta with a customized explanation of MathJax, or this comprehensive meta post on Math Stack Exchange.
In case folks want to change the link, we decided to start a meta discussion. If you have an idea for a page to link to, post it as an answer below. If there's a consensus about a specific option, the Community Team can make the change.