In most of WordPress themes, there is not meta description and meta keywords handle. This result every page of site has a empty description and keyword in page header, which is not good from search engine’s perspective.
This can be workaround by installing plug All in One SEO. But for those who concern plugin will slow down their sites, here is a simple hack, all needs to do here is just adding a few lines in header.php.
Firstly open header.php, find this line <meta http-equiv=”content-type” content=”text/html; charset=<?php bloginfo(‘charset’); ?>” />