Use the Testimonials module to add a basic slider with testimonials to your layouts, or any other set of text and images that you want to display one by one with either autoplay or navigation.
If the Testimonials module is the only module in a row, select Wide so it takes up the entire row.
If you are using the Testimonials module with other modules in the same row, set the layout to Compact.
You can add as many testimonials as you like and customize a variety of options, such as autoplay, animation effects, and navigation choices. Each individual testimonial has a Text Editor box, so you can add anything that a WordPress editing box accepts, such as headings, text, and images.
Note that although it's called a Testimonials module, there's nothing to stop you from using it for other purposes, because it's basically a slider for any headings, text or media.
For example, you could use this module on an About Us page, where you want to introduce each of your team members. And not just people – you could set up something like a portfolio of your creations, in which each image has a description that's too long for a caption. Or, you could have a selection of your favorite quotations, displayed one by one.