Let's say I have the website : www.animals.com or www.pets.com, and I create subdomains like : dog.animals.com, cat.animals.com, house.animals.com, lamb.animals.com.I know that subdomains are seen by Google as independet websites.After I create those subdomains I put a link on everyone of them to the main website ( www.animals.com ), so I build a list of related backlinks. Is this a good strategy or i'm missing something ( maybe I don't know something).
You could do that. But as all these links come from the same IP, their value is very low. Not a good SEO strategy to promote the main site, methinks.
But, if the subdomain contained a keyword that it's sole content page was optimised for, would that help SEO? Even if the nav links and template were the same as the main site?
I just came across this old post in Google while looking for something else, but I figured I'd respond. As Siraxi had mentioned, the links you created from all your subdomains (dog.animals.com) are not very high value because they're all coming from the same IP address. They are also all seen as different websites by search engines. The way to correct this would be to make new pages for all these subdomains on your original site, for example www.animals.com/dogs. This is a better URL structure. It's using your keywords in the URL of the page your trying to optimize, but it's also crediting that page to the original website. One you've created your new pages, you will need to do a '301 permanent redirect' of all the old subdomains to the new pages you created. This way search engines will know to permanently send inquires made to the old subdomains (and old inbound links) to the new pages of the main site.
you can build google inlinnk structure it will goes under on Site SEo.. If you need backlinks try to get links from others with different IP