Markdown
Markdown is a simple language for writing rich-text documents using plain text.
Deeper Knowledge on Markdown

Markdown: Detect Broken links
Use markdown-link-check and Bash to detect broken links

Markdown Code Comments
How to Comment a Markdown File Markdown doesn't include specific syntax for comments, but there is a workaround using the reference style…
Broader Topics Related to Markdown

Computer Languages
Computer Languages: How humans tell computers what to do