While the default of your post is Markdown, you can change to HTML (somehow my button to switch to HTML is missing) if you are familiar with that.

To know more about Markdown, click on Markdown Styling Guide for a quick introduction.

Markdown Guide can be found at this link: https://guides.github.com/features/mastering-markdown/

Rather than re-reading the guide, here's a quick cheatsheet:

**bold**
_italic_
~~strikethrough~~

# Header 1
## Header 2
### Header 3
- bullet points
> Blockquotes

@tysler
#Tags

Column1 | Column 2
----|----
contents 1 | contents 2

bold
italic
strikethrough

Header 1

Header 2

Header 3

• bullet points

Blockquotes

@tysler
#Tags

Column1	Column 2
contents 1	contents 2

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Have fun!