There is a wonderful post dedicated to MathJax code found here: MathJax basic tutorial and quick reference
The only problem I see with this post is that the additional contents below the original post are not easily accessible from the main post. For example, if you were only interested in figuring out how to type matrix notation then you would have to scroll down until you find it, or perhaps try a keyword search. I think that it could be a lot more user friendly if there was something of a table of contents amended to the original post that could essentially provide a hyperlink to the posts below where users have contributed substantially.
I am just wondering if there is a way to hyperlink to the comments below. In my downtime I think it would be fun to organize, but not sure if Math Meta has that type of capability?