I am have a query about regarding reselling product's content. In this case of reselling the product should I build content on my own and rewrite the original description in my own way. Or, should I just copy the content from the original page of the product. Which one should help me rank in Google better?
Google's John Mueller has made this perfectly clear in one of his videos that rewriting content in order to resale the product can't help you rank better. So, why bother it? Just copy the original content. You should look other ways to get ahead of your competitors in the SERP's.
Rewriting the original content in your own words expressing your own feelings and experiences about the product can be used to increase the trust among the customers but they are not going to get you ranked well in the SERP's.
Re-writing the product can be good for sales but they are not going to help you get ranked better. For that you have to consider SEO.