Markdown | cheatsheet and online editor

1. Cheat sheet

https://www.markdownguide.org/cheat-sheet/

 

2. Online editor

http://www.mdeditor.com/

 

3. PHP markdown parser: Parsedown

https://github.com/erusev/parsedown

https://raw.githubusercontent.com/erusev/parsedown/master/Parsedown.php