Nicholas Cifuentes-Goodbody has a series of Youtube videos on academic writing in plain text. This one covers Markdown, but he also looks at Latex, Pandox and Marked 2, among other things. This is an excellent introduction, especially if you are the kind of person who benefits from a visual guide. It includes a primer, but if you don’t need the basics, you can skip to the demonstration that starts aroud 5:00
The entire channel is worth checking out.