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>
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For more info visit github documentation