Markdown Guide
Easy to use Markdown Guide to master Markdown
Markdown is getting to be popular and most editors are now accepting the basic Markdown syntax. It's a good idea to get some fundamentals on how Markdown works. Soon you'll discover why more and more people are using it.
Matt Cone has put together an excellent Markdown Guide which makes it easy to understand the basic syntax . There's a section about the extended syntax which isn't supported in all platforms - but good to know the possibilities.
Website Description
The Markdown Guide is a comprehensive Markdown reference designed for novice and intermediate users. It was born out of frustration with existing Markdown references that are incomplete, inadequate, or both.
https://www.markdownguide.org/
Popular Playgrounds
If you want to play around with Markdown try https://dillinger.io/, it's a great way to get a real time view of how Markdown works.