Simply Go to Google trend and type "review" and you will get a product which has been trending:- Here is in Now, just write reviews on this product and you will get sales. If you are a blogger and write tutorial then search "how to" Write or create a video on this topic and get traffic. You can also select your category. (I choose "Real Estate USA Here) Search for "best" (& filter other country and category) And you will get this result:- That's all. Very Simple. Comment your feedback on this.