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gg=G

This indents the entire file!

And below are some of the simple and elegant commands used to indent lines quickly in Vim or gVim.

To indent the current line 
==

To indent the all the lines below the current line

=G

To indent n lines below the current line

n==

For example, to indent 4 lines below the current line

4==

To indent a block of code, go to one of the braces and use command

=%

These are the simplest, yet powerful commands to indent multiple lines.