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Just a follow-up question, my site is built from the scratch so I have to insert the rel canonical manually, the normal canonical URL that I have noticed is http://ww.sample.com/ does it really needed that every canonical URL will have a slash (/) symbol at the end? Thanks

So the basis on which URL that I'm going to use will be the authority of the page right? The higher page authority the better.

I have encountered this weird problem about duplicate page content. My site got 3 duplicate content similar on the link structure below. If I'm going to use rel canonical does it help to resolve the duplication problem? Thanks

http://www.sample.com

http://www.sample.com/

http://www.sample.com/index.php

Thank you for the inputs and feedbacks

400-500 words per page?

I would like to ask what is the recommended number of words on your page?

Thanks