I have seen many people here on Brilliant (especially solution writers) who don't know the LaTeX formatting and even if they know, they struggle to use it because they can't find the right code for the required symbols. Recently, I found a wiki link with the entire list of LaTeX symbols and their respective codes (maybe some are not there). Anyways, I thought of sharing that link, so here's the link : LaTeX symbol guide
Also, here's a link for LaTeX font styles and colors : LaTeX/Fonts
Also, there are other certain Brilliant wiki posts relating to this. If this note helps you, be kind to reshare it so that other Brilliant users can improve their solutions, etc by correctly using LaTeX symbols.