Setup Slider Section
In order to setup the slider, follow the below steps.
1. Create a new Page and name it, set it's featured image, title, and the content.Repeat this process for other slides.
2. Go to Appearance >> Customize >> Theme Settings >> Slider Section
Select the Page which you have created for slide1, slide2, slide3, slide4 and do click twice on the check box of show/hide after selecting the pages for slider.
Once you have done with this you will see the slider on your front page.
In this way you can setup slider.