We are building car selling website where users can upload their second hand cars to be sold to other interested buyers.
Currently we have a simple form where we ask user the vehicle and personal details before uploading the car on our website. We want to move up this page's search engine rankings. I just read that freshness or frequently changing pages rank higher in SEO.
What if we start showing customers testimonials somewhere on this page. As these would be randomly picked, would keep on constantly changing, would it help me in improving search engine rankings of this page?