The anatomy of a WordPress theme. Index.php – home The index file controls what the homepage of your WordPress theme looks like. By default it is a loop that queries and then displays the most recent blog posts, with a link in the bottom to view previous posts. Alternately, you can specify in wp-admin -> settings -> reading to have the home page be a page you created yourself in WordPress. In that case, you specify a different page/URL for the regular blog posts to appear on, and that page is generated by index.php. Premium WordPress Themes.