\(\mathrm{\LaTeX}\)
Where to start
A good place to start would be the Overleaf documentation.
A list of symbols can be found here. Section 7 also contains further readings on \(\mathrm{\LaTeX}\).
One may also be interested in using a local \(\mathrm{\TeX}\) editor instead of Overleaf for a range of reasons. TeXstudio and TeXworks are two examples.
MathJax
Coming soon.