That depends upon what type of site you have. Is it purely informational or is it an e-commerce site? What is your niche? Different writers write for different types of content: i.e. tech writers, sports writers, health writers, political writers, copywriters. This question is certainly too generic. Do a search here. Many of currently discuss or have discussed unique content. Then, if you have a specific question about your site, feel free to repost your specific question as it pertains to your site.