So simple, so good

One of the easy to do things to have a good SEO is to prevent any 404 error in your page. Surely you can try to improve the 404 error or move it to another page depends on the query the users used; but if you want something easy, you have to use this plugin.

All 404 errors will become 301 to homepage, so 404 errors will disappear and in most of cases, it will be the best option you can take