How to fix WordPress 404 "Not Found" page Error?

To fix the issue with the 404-page error quickly, please click WP Dashboard => Settings => Permalinks and switch Common Settings to Plain: http://prntscr.com/12ij8x0 then save changes. This step will fix your issue.

Additional please check this link: https://turbofuture.com/internet/wordpress-not-found-error-fix

+