There are some text formats which help us to provide more readable answers, comments, and questions, but I learned them by editing other answers. I don't know where the source is, for example:
code style (Ctrl + K or `your text`)
Big Style (#Big Style)
Bold Style (Ctrl + B or
Some functionalities like:
≤ → ≤,
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 the same as TeX symbols, and it's not easy to find the true format. I think there should be a guidance for these formats and other hidden features of Stack Overflow.
Also these formattings do not work in code style. For example, if I have pseudocode and I want to use &x; formats, it wouldn't work there.