MDX is Markdown with JSX components. Use Visual mode for most edits; switch to Source for precise control. Page metadata lives in Page settings, not frontmatter.
Markdown basics
In Source mode (and in mixed Visual/content areas), standard Markdown works:
# headings through ######
Bold and italic
Lists, blockquotes, horizontal rules
Fenced code blocks with language tags
Links [text](url)
Headings in Markdown map to styled typography in the preview.