404 error responses

Selected answers from the Dumb SEO Questions Facebook & G+ community.

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  Ankit Goyal: Why 404 error responses come in Google webmaster's crawl error section even if we correct all the 404 error pages manually?
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  Tony “Tiggerito” McCreath: How do you correct a 404 page?
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  Jim Munro: Just to clarify, Ankit, are you checking the date detected date of the 404's reported to make sure it is after the fix date?
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  sandhya k: hi.i have one doubt one site go to spam then how to reduce spam in site.plz any body explain.