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No doubt on this question. Forum is the best off page technique for SEO


ISO 9001

If 404 error means the URL is not existing. So we can fetch some information in that url or other wise you can give some other link like 301 permanent redirection. By doing this we can avoid this 404...

yes, absolutely correct. 301 is the permanent redirection from on website to another website. it is very helpful when ever your changing domain from one domain to another domain at the time no need...