I have learned about his SEO trick and it's about setting using subdomains to rank high for a particular keyword? I mean lets just say I want to rank high for keyword "Internet Marketing" obviously I cant register domain name InternetMarketing(dot)com because it's already taken the trick is to use subdoman.
The have no affect on your SEO as subdomain is viewed by Google as new website and as such has to be separately submitted to Google and verified without mentioning that you will have to do different SEO for this subdomain!
If you want to do build SEO for single domain website, do not use sub domain because search engine optimization would not give credit to your domain. If you use sub domain then it’s consist separately website.
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