WordPress was officially released in 2003. The current stable version is 3.2.1. WordPress uses The Loop as its main process. Code should not be placed directly in core files and instead can be extended through plugins, themes, or mu-plugins. The two types of hooks in WordPress are actions and filters. Debugging can be turned on by defining WP_DEBUG as true. JavaScript and CSS should be enqueued properly using wp_register_script, wp_enqueue_script, wp_register_style, and wp_enqueue_style. Transient API allows temporary data storage. A minimum of style.css and index.php are required for a WordPress theme. The widgets_init hook