$\LaTeX$ is a software system for document preparation. When writing, the writer uses plain text as opposed to the formatted text found in "What You See Is What You Get" word processors like Microsoft Word and Apple Pages.
Muna does not support the full LaTeX language, only the part that you need to render math equations such as:
LaTeX can become very complex very quick. But frankly, unless you are a math or physics student trying to memorise stuff like Fourier Transforms and Schrödinger's equations, you can probably get away by knowing just the following 4 rules of syntax:
If you need more than this, there's a quick guide to the main LaTeX markup for math in this site.
In the next page you will learn how to use LaTeX in Muna.