认识
官网：https://daringfireball.net/projects/markdown/
Markdown is a text-to-HTML conversion tool for web writers. Markdown allows you to write using an easy-to-read, easy-to-write plain text format, then convert it to structurally valid HTML.
组成
语法
https://daringfireball.net/projects/markdown/syntax
标题：# ## ### #### ##### ######
代码：`This is code.`
链接：[a link to example.com](http://example.com “xxxx”)
改进
GitHub Flavored Markdown
Markdown Extra
参考
Wikipedia / Markdown / https://en.wikipedia.org/wiki/Markdown