https://guides.github.com/features/mastering-markdown/

https://markdownlivepreview.com/

  Hyperlink
[Text](URL)

  Italic
_ or *

  Bold
**

  Element
`This text will be in inline box`

  Quote
> hello world

  Numbered List
1. item1
1. item2
  1. item2a

  Unordered List
* item1
* item2
  * item2a

  Underscore
\_


  Header Tags
#
##
###
...
######