Question 1

What is Markdown and why is it widely used?

Accepted Answer

Markdown is a lightweight markup language created by John Gruber in 2004 that converts plain text to HTML. It uses simple symbols like # for headings, **bold**, *italic*, - for lists, and [text](url) for links. Markdown is used on GitHub, Reddit, Stack Overflow, Notion, documentation sites, and most static site generators because it is readable as plain text and converts cleanly to HTML.

Question 2

What is the difference between CommonMark and GitHub Flavored Markdown (GFM)?

Accepted Answer

CommonMark is a standardized Markdown specification that resolves ambiguities in the original Markdown. GitHub Flavored Markdown (GFM) extends CommonMark with: tables (| col | col |), task lists (- [x] done), fenced code blocks with syntax highlighting (```js), strikethrough (~~text~~), and autolinks. GFM is the de facto standard on GitHub, GitLab, and many developer tools. Most Markdown previewers support GFM.

Question 3

What are the most common Markdown syntax mistakes?

Accepted Answer

Common mistakes: (1) Missing blank line before a list — Markdown requires a blank line to start a list after a paragraph. (2) Forgetting to escape special characters like *, _, [, ] inside text. (3) Mismatched emphasis markers — mixing * and _ in the same word. (4) Incorrect link syntax — the parentheses must directly follow the brackets: [text](url), not [text] (url). (5) Indenting code blocks incorrectly — use 4 spaces or a fenced block (```) for code.

Question 4

Which HTML elements can I use inside Markdown?

Accepted Answer

Most Markdown processors allow inline HTML. Standard safe elements like

, , ,
, ^{, _{, , , and work in most environments. However, GitHub strips}}

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