A custom 404 page is a page that shows up when a visitor tries to go to a page on your website that doesn’t exist. To improve the user experience and assist users in finding what they’re looking for, you can design a unique 404 page in WordPress. Here’s how to make a custom 404 page:

Create a new page: Log in to your WordPress dashboard and create a new page. You can name the page “404” or something similar. This page will be your custom 404 page.

Customize the page: Add content, images, or other elements to help visitors find what they are looking for. You can also include links to your homepage, sitemap, or contact page to help visitors navigate your site.

Update your theme: You need to change your article to your custom 404 page if you want to see it. You can do this by opening your theme’s file editor and adding the following code to your theme’s 404.php file:

PHP Code:
<?php
status_header(404);
get_template_part(404);
exit();
?>

Save and test: Save the changes to your theme and test your custom 404 page by visiting a non-existent page on your website. If your custom 404 page isn’t showing up, try clearing your cache or checking the settings for your theme to ensure it’s set up correctly.

Note: If your theme doesn’t have a 404.php file, you can create one by copying the code and pasting it into a new file in your theme’s folder. Creating a custom 404 page can provide a better user experience and help visitors find what they are looking for, even if they need help finding a broken link or non-existent page on your site.