I have seen many people on DP are writing Unique content and selling them....Ho w can a same person write on Finance,insurance,loans,yoga,etc.. please tell me some tips to produce unique content.
You may not be an expert in all areas, but you may get yourself familiar with the subject matter by doing research. Then you write about what you have learned.
Research is the key. If writers needed to be experts on the topics they wrote about they'd probably have a career in a particular industry and not be writing about it Sites like Wikipedia are your friend.