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For Hacktoberfest, you're going to read and/or write a lot of documentation, most of them in Markdown. Comments and pull request descriptions on GitHub and GitLab are in Markdown. Even this article on DEV.to is written in Markdown. You can see the article's source file here on GitHub.
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CodeRabbit
CodeRabbit: AI Code Reviews for Developers. Revolutionize your code reviews with AI. CodeRabbit offers PR summaries, code walkthroughs, 1-click suggestions, and AST-based analysis. Boost productivity and code quality across all major languages with each PR.
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linguist
Discontinued Language Savant. If your repository's language is being reported incorrectly, send us a pull request! [Moved to: https://github.com/github-linguist/linguist] (by github)
As of now, some 583 languages are being supported for syntax highlighting. You can access the full list here.
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markdown-here
Google Chrome, Firefox, and Thunderbird extension that lets you write email in Markdown and render it before sending.
Adam Pritchard, "Markdown Cheatsheet"