How to fix 404 error on my website

[ethanmillar]

301 Redirection is best option to solve 404 errors on your site.
Redirect relevant page to your 404 page
So when ever user open your 404 page at that time the user redirect to the most relevant page.

If you don;t have relevant page in your site for redirect 404 then you can block those pages by using robots.txt

Thanks