Driving content on your webstore with a blog can really boost your SEO as long as you have the time, energy and inspiration to keep it updated. However, many people ask us: should I put my blog on a sub-domain or a sub-folder? If your domain is www.mywebstore.com then a blog on a sub-domain would be blog.mywebstore.com and a sub-folder would be www.mywebstore.com/blog
If you want to host your blog on a completely separate server from NitroSell’s, then the sub-domain is the best solution. You host your blog on the platform of your choice, e.g., Wordpress, Blogger, Blogspot, etc., and give NitroSell Customer Support the IP address or CNAME and we will map it to blog.mywebstore.com (assuming we’re controlling your domain’s DNS).
Google penalises duplicate content in its attempt to wipe out spam and, in the past, putting a blog on a sub-domain did not help with SEO on your primary domain. There used to be a belief that the SEO juice would not “flow to your primary domain” if you had a blog on a subdomain and that this would hurt your search engine rankings.
The latest position is very well explained here in a 2 minute video by Matt Cutts, the public face of Google SEO: