I am confused if which is better to use for good SEO , the link with "www" or without it? Example: "http://www.example.com" or "http://examle.com" . Please give me a resource or a link which stating that your answer for this is really true
It doesn't matter. Here is a resource http://www.thegermz.com/tutorials/seo/seo-tutorial-part-4#domain But since it was written by me I guess it doesn't matter? Anyway just take my word for it. As stated on the article, you can choose your preferred domain on the Google's webmasters tools section. The best of luck.