How to add custom, sortable columns to the edit posts screen for custom post types in WordPress.
How to add custom image sizes and retrieve the custom values set for these image sizes.
Adding and using custom file headers in WordPress themes and plugins.
If you make mistakes, make them big.
How to remove menu pages and sub-menu pages from the WordPress administration menu.
How developers can build install and upgrade routines into their theme and plugin projects with ease.
How to prevent a theme’s background image from overwriting the user-selected background color.