At Meth, you can have a section at the homepage where you can present testimonials. You can output this section via a testimonials widget, - a process we will see later in detail-
In order to create the testimonials, go to testimonials > add new. You will see the following:
At the very first field, enter the name of the person that is supposed to have written the testimonial, and at the main content field below, write down the testimonial. Hit Publish and you are good to go. Continue by adding more testimonials with the same way.
In order to show the testimonials at the frontend, you should use a "Section:Testimonials" widget. More details at the "Working with Widgets" section of the documentation.