This post shows you how to write headers in different sizes using Markdown. 
# This is an <h1> tag

## This is an <h2> tag

### This is an <h3> tag

#### This is an <h4> tag

##### This is an <h5> tag

###### This is an <h6> tag

This is an <h1> tag

This is an <h2> tag

This is an <h3> tag

This is an <h4> tag

This is an <h5> tag
This is an <h6> tag