Welcome! WordPress themes are one of the first and most important topics that one must understand to be good at WordPress development. Themes underlie the entire visual half of WordPress site, but often grow to do even more. We’re hoping your find these free content very helpful, as we think it covers some of the most important concepts in doing WordPress theme development for yourself.

“WordPress is a factory” is a core analogy designed to clarify what WordPress is as a technical system.

Your first million dollars. The game-winning catch. A guest post in Smashing Magazine. These are life’s moments of pure success, and David had one of them this week. We’ll keep you posted on the other two.

I’ve got a project that needs to treat WooCommerce category pages differently from its subcategory pages. Both use taxonomy-product_cat.php, though. What I’d really love to do is change just the search field in that template, depending on whether a particular page is showing a top-level category or a subcategory.

In WordPress, pre_get_posts is an action that makes it possible to modify an existing WP_Query, before that query is actually run. pre_get_posts offers some solutions that are more performant than writing a custom WP_Query, and enables solutions to other problems that would be quite difficult otherwise.

Today I’m going to discuss a new, and very nice, site speed improvement that became possible in WordPress 4.1. What changed? The introduction of a new filter, script_loader_tag. This filter lets us easily change the HTML markup of enqueued script elements—that is, of JavaScript files that were correctly added into a WordPress site using WordPress’s wp_enqueue_script function.