To www or not to www? Whats the best URL for Seo? Google and the other major search engines consider both to be separate sites so therefore you should create a redirect from one to the other and only use one in your internal links.
These days your hosting provider normally offers a choice when installing WordPress to your domain and you will normally find one redirects to the other without having to create a 301 permanent redirect.
Here’s an explanation of what canonicalization means by Googles Matt Cutts:
Q: What is a canonical url? Do you have to use such a weird word, anyway?
A: Sorry that it’s a strange word; that’s what we call it around Google. Canonicalization is the process of picking the best url when there are several choices, and it usually refers to home pages. For example, most people would consider these the same urls:
But technically all of these urls are different. A web server could return completely different content for all the urls above. When Google “canonicalizes” a url, we try to pick the url that seems like the best representative from that set. Source Matt Cutts (Google)
Sticking to the same URL structure is the simple version. I don’t use www and don’t believe it makes a huge amount of difference.
If you’re wanting to change your URL i think the best way is via a redirect using your web hosts cpanel or you could backup your entire site and restore it using a different URL or domain name.
If you don’t know which keywords have the traffic and make the money, you are wasting your time.
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