WP extension (enhancement) (tag)
| add_theme_support() | Registers theme support for a given feature. |
| register_post_meta() | Registers a meta key for posts (post custom field). |
| register_post_status() | Register a post status. Do not use before init. |
| register_post_type() | Creates a new post type or changes an existing one. |
| register_taxonomy() | Creates a new custom WordPress taxonomy. Allows you to change an existing taxonomy. |
| register_term_meta() | Registers a meta key for terms. |
| wp_install_defaults() | Creates the initial content for a newly-installed site: categories, posts, pages etc. |