hi friends. i see many website that selling products or download/upload center websites in top search results. i see many online shop that are top in SERPS with any of their products or products list.in fact,any product added by admin,ranked in google with a new url (without any backlinks or many social network score(fb like,sharge , twitt,plus one)) also many download centers,with many keywords that start with "download" showed top in SERPS. remember, many of those,not ranked in social networks. now, if i want start an online shop how can i seo that?how i must building links? what safe ways are there for seo a website with many keywords such as wikipedia?