The homepage includes a featured posts slider. To setup your homepage slider, navigate to Appearance > Customize > General Theme Settings. Here you will see the options for the Homepage Slider.
Select None, Recent Posts, or choose one of your blog categories to be displayed for the homepage slider. You can also exclude your slider posts from being displayed on the homepage, automate the slideshow and adjust the slide speed.
You can alternative display a custom slider. This would be done using any 3rd party plugin that can be displayed using a shortcode. Simply install the plugin of choice, create your slider then copy your slider shortcode and go to Appearance > Customize > General Theme Settings >Homepage Slider and enter the shortcode into the Custom Code field.