By using it a lot …and creating a markdown “cheat sheet” filed as the top notebook to make it easy to find. In there put anything useful: underscore, superscript/subscript, changing text color, aligning text left/center/right, how to use anchors within notes, how to jump directly to a heading in another note etc etc.

By using [TOC] in conjunction with headings in your notes & you can instantly jump to the appropriate heading within your cheat sheet note to look up how to use the markdown