I have a blog on wordpress and i got like 150 pages according to Google webmaster that appears 404 error. Now there are so many plugins that says it will help redirect them to your home page so there remains no error. Recently one SEO suggested me not to do that coz using 301 redirection should only be used for redirected pages and if there is no redirection than let them be 404. Now i don't know what is the reason behind this but sounds logical and yet seeing so many plugins a little confusing to me. So, help me here please, should i use plugins to redirect or leave everything 404? will doing 404 kill my pagerank (1) ?