Topic
Step-by-step guides for getting things done in WordPress.
WordPress Tutorials
Excluding a page from the plugin cache is half the job. The host cache and the CDN keep their own copies, so a page you excluded once can still be served stale from two other places.
WordPress Tutorials
The PageSpeed warnings about unused JavaScript, unused CSS, cache policy and script execution each have a WordPress-specific cause, a code fix, a plugin fix and a way to break the site.
WordPress Tutorials
A failed Core Web Vitals assessment on WordPress is usually an LCP problem. Read the field report, split LCP into its four parts, and fix the part that is actually slow.
WooCommerce
A store has two halves: catalogue pages that can be cached like any site, and cart, checkout and account pages that never can. Speed each half with different tools.
WordPress Tutorials
Deferring a script with this filter detaches it from the dependency order WordPress maintains, and any inline script attached to it runs before it loads. Core has had a strategy argument since 6.3 that handles both; the filter remains for what the argument cannot express.
WordPress Tutorials
The filter runs before the insert, which is what makes it the right place to force a status or rewrite a title without a second save. It also hands you slashed data, and a string operation that ignores that corrupts every apostrophe.
WordPress Tutorials
A size registered with add_image_size exists for templates and nowhere else. This filter is what puts it in the Image block's Resolution dropdown, and it does nothing for images uploaded before the size was registered.
WordPress Tutorials
The filter receives a context, and the context is the whole point: widening the post context affects every call to wp_kses_post across the site, including places that trusted it to strip exactly what you just allowed.
WordPress Tutorials
The hook registers the box; it does not save anything. Saving is a second hook with a nonce, a capability check and an autosave guard, and a meta box without all three either loses data or accepts it from anyone.
WordPress Tutorials
The column needs two hooks, not one: a filter that registers the header and an action that prints each cell. A column with a header and empty cells has the first and not the second, which is the most common half-finished state.
WordPress Tutorials
The hook fires on every admin page and passes the current screen's hook suffix, which is the only thing standing between a plugin that loads one file on one screen and a plugin that slows the whole dashboard.
WordPress Tutorials
The filter receives the user on success and a WP_Error on failure, and every role-based snippet that forgets the second case throws a fatal error on a wrong password. It also only covers the standard login form, which is not the form most plugins use.