how to solve 404 error in website?

1. Retry the web page by pressing F5, clicking/tapping the refresh/reload button, or trying the URL from the address bar again.
2. Check for errors in the URL.
3. Move up one directory level at a time in the URL until you find something.
4. Search for the page from a popular search engine.
5. Clear your browser's cache if you have any indication that the 404 Not Found message might just be yours.
6. Change the DNS servers used by your computer, but usually only if an entire website is giving you a 404 error, especially if the website is available to those on other networks