There are some text formats which help us to provide more readable answers,comments,questions but I learned them by Editing other answers, I don't know where is the source, for example:
code style (ctrl+k or `your text`)
Big Style (#Big Style)
Bold Style (ctrl+b or
some functionalities like:
≤ → ≤ or
Ω → Ω or
a<sub>1</sub> → a1 , ...
But I don't know other text magics for this site, The
&x; format is not exactly same as Tex symbols and it's not easy to find true format. I think there should be a guidance for this Formats and other hidden features of SO.
Also this formattings does not work in code style, for example if I have a pseudocode and I want to use &x; formats It wouldn't work there.