I have a website, every time I login to Google webmaster tools, I found many new discovered 404 error links, the problem is not in 404 errors itself, but when Google see them and count them for you!, I think that this count used in the overall site evaluation and ranking, I decided to develop All 404 Redirect to Homepage WordPress Plugin to solve these errors in SEO way by redirecting them using SEO 301 redirection.
How to use the plugin?
The 404 error pages hurts the rank of your site, this smart plugin is a simple solution to handle 404 error pages by using 301 redirect.
Look at the following diagram which represent the 404 errors per time, we see an increase of error rate in the last time interval.
Our simple plugin will solve this by trying to redirect all 404 error pages to home page or any customized page, see the control panel for the plugin in the next image
After installing the plugin, make sure that it is enabled from the field status in the control panel above, if you want to disable the plugin functions, just set the status to disabled.
Page officielle : https://fr.wordpress.org/plugins/all-404-redirect-to-homepage/