Hi, I want to know more about authority web sites. I have many articles and I want to invest them in a good way, they're actually talking about different subject but about the same domain. I need to clear some questions before I start, so please if you can answer my question I'll be very thankful : - Do I need to do offpage SEO for authority website ? - Does my keyword density matters ? ( I have a EMD domain ) - Is copying some content from Wikipedia counts for duplicate content ? I mean, something like a definition - 2-3 lines. If you have any advices to give me about authority websites that's will be great. Thank you.