You can display a Call To Action button to promote your company in this section. Please follow the below video tutorial or the following steps to configure Promotional Section

You need to create a page for Promotion first.

• Go to Appearance> Customize> Home Page Settings> Promotional Section
• Select a page or post to display the title and description of the section.
  • The Title and description of the selected page/post will display as section title and description of the section. If you don’t have a page, you can create a page.
• Select Background Color.
• Enter Button labels and links. You must enter a link to display the button.
• Click Publish