For headings -> <pre># text…… -> h1 ## text….. -> h2 . . . . . . . . . likewise upto 6</pre>
For inserting a code block, 2 or more tabs are inserted before the text
Text.....
.........
.........
Block
heading
##line 1
##line 2
`text` -->
text
</pre>` ` + > .... text ....` [ ` $ ] ` `
</pre>[text](link)
</pre>
GoogleTo insert a image<pre>
</pre>
For more info visit github documentation