| Start here | Set up your learning environment. |
| The seven dirty words | An introduction to WordPress plugins, filters, and regular expressions. |
| I, spy | An introduction to actions, WP_User, and wp_mail(). |
| Slugs! | An exercise in using actions and filters to alter data on save. |
| You might also like... | An introduction to WP_Query, conditional tags, and transients. |
| Accessibility | An exercise in using cookies and user options to store display information from a widget. |