By default, WordPress default filters adds rsd_link() and wlwmanifest_link() which outputs the following lines within the <head></head> section of your theme template file:
<head> ... <link rel="EditURI" type="application/rsd xml" title="RSD" href="http://safirulalredha.com/xmlrpc.php?rsd" /> <link rel="wlwmanifest" type="application/wlwmanifest xml" href="http://safirulalredha.com/wp-includes/wlwmanifest.xml" /> ... </head>
You can remove clutter of unused rsd_link() (Really Simple Discovery) or wlwmanifest_link() (Windows Live Writer) by adding the following to your theme functions.php:
remove_action('wp_head', 'rsd_link');
remove_action('wp_head', 'wlwmanifest_link');
Remove rsd_link() and / or wlwmanifest_link() WordPress plugin
Optionally, you can download remove rsd_link() and / or wlwmanifest_link() WordPress plugin. To install, please read WordPress Plugin Installation or simply extract the zip files to your wp-content/plugins folder and activate.
wp_generator()
In case that you’re using the latest bleeding edge version of WordPress, in revision 6195 WordPress introduced a new default filter that hooks a generator tag to wp_head() which outputs:
<meta name="generator" content="WordPress/..." />
Besides the <head></head> section of your theme template file, it also creates the generator XML or Comment for RSS, ATOM and etc.
To remove the generator tag, just add remove_action('wp_head', 'wp_generator'); to your theme functions.php.