Markdown Cell
A cell holding formatted text in Markdown - headings, lists, links, equations, images.
- Renders via MathJax for inline LaTeX.
- M to convert to markdown; Y back to code.
- Single biggest leverage move for notebook readability.
When to use: Documenting steps, framing rationale, embedding equations.
Example: ## Step 2: Train baseline, then a one-paragraph rationale, then the training code cell.