How can I fix an Error 404 if I'm the website owner?

As a website owner, you can fix an Error 404 by: 1) Correcting the URL in the server configuration. 2) Implementing a 301 redirect (permanent redirect) from the old URL to the new URL. 3) Ensuring all links on your site are valid and point to existing pages. 4) Regularly checking your site for broken links using tools like Google Search Console.