horizontal alignment - How to start a new line in \boxed{}? - TeX - LaTeX Stack Exchange
macros - How to add blank lines in new commands in Latex - Stack Overflow
Anki 2.1 : Block mathjax does not ignore newlines? : r/Anki
Overleaf - If you're collaborating with someone who's just starting out with LaTeX, we have a few nice tutorials available, including this one that gives a first run through of the core