Social proof is a psychological phenomenon where people reference the behavior of others to guide their own behavior. No matter what a site is about, using quotes will support the products, service, goal or claim.
There are a lot of ways to present them, here are just a few examples.
This is unbelievable. After using this cool theme my buisness started skyrocketing
All the things he knows and can explain about business and digital strategy are simply amazing. It transformed my thinking with big benefits to the business.
Now people stay longer on our pages, they see more of the site and lead intake trippled!
The use of a background image that supports the type of quotes or website claim can attract attention amd really drive the point home.
If you have a lot of testimonials, or want to present them differently in different sections of the site you can consider using a caroussel.
Adding rating, in this case the number of colored stars, helps to build trust in the cause of the site or section.
The configuration of the caroussel, e.g. auto-play, happens in the html element with class .caroussel.config.