When you type a specific age of the website in the web browser, and it says 404 not found error. The WordPress error 404 is a frequent error that generally comes to the site because of
Users have typed the wrong URL
The web page address has been removed modified
PHP memory issue
An issue in the permalink structure
Well, you can solve this error easily. Here are some tips
Check URL and type it correctly
Go to the permalink section of the WordPress website and re-configure it