| Commommark is the best, then looking at the most commonly implemented extensions: - Superscript with hat symbol (^) - Hidden content (also known as spoiler tags, content warnings, click-to-reveal, etc...) with two pipe symbols (||) at start and end of hidden content. Interact with the content to show the content inside. - Table syntax to show tabular data and align content with pipe, hyphen, colon symbols --- After that, I'd look at the extensions that are only useful for the use-case you're targeting: - Subscripting with tilde symbol (~) - IDs, Classes and Attributes - Task lists - Sections / Containers - Language labels for code blocks - Math Support (mathml, latex, katex, etc...) - Table of Contents / Footnotes - Definition lists - etc... |