I have 4XX errors on WordPress blog.

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

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  Mike Cooke: Ok decided to use moz for all tracking and I have a 4XX errors popping up all around the wordpress blog and wondered what would be the best advice to deal with these.These are all 404s in the link my question really is it best to leave these alone or redirect to another area?
  
  
  
  http://pastebin.com/PkgwxvG2  ;
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  Mike Cooke: I have removed the root domain out so I am not linking as per rules on the community.
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  Richard Foulkes: 404's are okay to have it you have a relevant 404 page. I normally put no index on catergories as they cause confusion for the page/2 I'd resolve this if I assume they are page 2 of content like a blog roll with lots or pages? Then canonical tags the /phc-blog/
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  Boyan Sabev: If the 404s come froim external links redirect. if from internal links remove or update the links on your site.
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  Edwin Jonk: +Mike Cooke ;thanks for respecting our rules. However can you share your domain?
  
  P.S. we do allow "linking" as long as the link is not "active", e.g. example(dot)com. ;
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  Mike Cooke: +Edwin Jonk ;thanks for the heads up, the more I have looked at this interesting enough most of the report errors from moz I am getting back are due to duplicate content from wordpress from categories, where a posts is displayed in two categories and classed as duplicate content. I have got Yoast intalled and have set the noindex of subarchives to prevent /page/2/ etc just more interested to see if anyone else has had this issue and if there is a simple way round it.