How to fix 404 error in my website?
 

How to fix 404 error in my website? please someone give easy way or idea to fix 404 error in my website.

A 404 error is an HTTP status code that means that the page you were trying to reach on a website couldn't be found on their server. The 404 Not Found error might appear for several reasons even though no real issue exists, so sometimes a simple refresh will often load the page you were looking for.

Redirect the 404 error some where else which is an error page you can tell your server to redirect people.
Correct the source link
restore deleted pages
ignore the not found error