These tutorials are appropriate for those new to WordPress, or for non-coders.
Addressing PageSpeed’s recommendation to Reduce Unused CSS improves your site’s overall score, along with the First Contentful Paint (FCP) and Largest Contentful Paint (LCP) metrics.
Removing unused CSS is closely tied with removing render-blocking resources, and the plugins available will often let you achieve both things at once:
Sometimes you might see this error when trying to upload an image in WordPress:
The server cannot process the image. This can happen if the server is busy or does not have enough resources to complete the task. Uploading a smaller image may help. Suggested maximum size is 2560 pixels.
Whenever a user creates a password for their account in WordPress, by default you see a meter telling you how strong your password is:
You may see this both on the backend, for example in the Edit User screen, and on the front end, for example when WooCommerce customers create an account in your shop.
This password strength meter feature is handled automatically by a few files, one of them being: zxcvbn.min.js
Turning off JavaScript in your browser can be helpful so that you can see which elements of your site require JavaScript to display. When troubleshooting PageSpeed issues and especially when trying to remove unused JavaScript, this is a quick way to see the impact of JavaScript on your site.
When things aren’t working as expected on your site, or you get an error notification from WordPress, you will need to check the error logs for your site.
WordPress runs on PHP and the error logs let you know when PHP had problems running code. PHP errors are often the reason plugins or your theme aren’t working as expected.
The concept of attached and unattached images seems to be a throwback to a time long gone when WordPress relied on these relationships between images and posts for some features like the gallery shortcode.
These days the concept is much less useful or relevant. But since it still has leftovers that are visible in the WordPress interface, it’s worth understanding.