Markdown is a simple, human-readable text language used extensively in Jupyter Notebooks, on GitHub and other code repositories, and elsewhere on the Internet (e.g., forums and blogs). Markdown lets us write readable plain text that can rendered as nicely styled text on web pages and other media, with headings, links, and other formatting.
Project Pythia uses MyST Markdown, which is an extension of CommonMark, which is in turn an implementation of Markdown. In fact, the page you are reading right now was written in Markdown! See the source on GitHub here.
Markdown was briefly mentioned in the previous section in the context of Jupyter Notebooks. Here we provide a list of recommended resources for learning more.
To learn the basics: the CommonMark docs, including their 10-minute interactive tutorial
To learn some of the MyST-specific syntax: the Introduction to MyST Markdown page within the Jupyter Book User Guide
To learn everything that you can do with MyST: the Authoring section of the MyST guide