By default when you activate the theme your homepage will display the recent posts. This is what we use in the demo. To change the columns, select a sidebar (left, right or none) and set the pagination style navigate to Appearance > Customize > Theme Settings and use the various tabs to change the look of your homepage.
For example, under General you will find an option for pagination style, under Layouts you can select columns and layouts, and under Advertisements you can add your own ad images.
If you would rather create your own alternative homepage, create a new page and then remember to set the new page as your static “Front Page” under Settings > Reading.