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There is no set number for ranking. You can have 100,000 backlinks, but if they're from sites like how to sell your house or for model airplanes, they won't help at all. You want links from relevant sites, and you'll want to get the other sites a reason to link to you, usually in the form of good content on your site.

DA IS THE DOMAIN AUTHORITY AND PA IS PAGE AUTHORITY. THESE ARE LIKE PAGE SCORE. THIS IS FROM 100 SCROCE. IT TELLS THE DIFFICULY AND AUTHORITY WEBSITES