For recent Google Panguine and Panda update, now-a-days it's hard to rank a site again i can say it is also easy. If you want to see your site in the first page of Google search result, you must be careful about your high quality unique contents of your site. The era of  Copy and Paste contents has been ended to rank a site in Google search result, so you have to focus on unique article. But now the question is how can you understand that your written article is really unique????? The answer is easy, you can understand by some free unique article checking sites, from where you can understand that your written article is really unique or not. These sites are:

 http://plagiarismcheck.org/home