I am handling a wordpress website for a client. It has around 4000 '404 errors'. I am thinking of redirecting it to the home page. But if I redirect, Google should not think that I am duplicating (though I am not doing). The other option is that I can request Google not to crawl the web pages that are '404 errors'. This '404 error' is due to the forum, which was linked to the website.
I request forum members valid suggestion / advice on solving this issue.