In chapter ‘Featured slider is showing posts’ you can choose what posts you want to displayed on front page (home page). Also, here you can choose where will be the featured slider – in header, or directly on the page.
If you choose option ‘Check to enable featured slider that showing posts on home page and front page’ – slider will be located directly on the page.
Featured slider will show featured image that you place to your post or page. You can download any other image instead of featured image. The recommended image size is 1300 x 470px – this size have featured image that will shown in slider. But if you will download new image for every post or page – you can use image with other height, but height must be the same for all images.