Multiple headers

Hi,

I would like to know how to make a different header for different page.
For example, I would like my header for post, project and 404 to be different from my index page.

I read that
https://codex.wordpress.org/Function_Reference/get_header

But I don’t understand where to put

<?php
if ( is_home() ) :
	get_header( 'home' );
elseif ( is_404() ) :
	get_header( '404' );
else :
	get_header();
endif;
?>

Also, does the name of the header is the name of the menu?

Thank you