The homepage widget displays a block at the top of the homepage. It’s a useful place to introduce you and your business but to honest it’s not that important. People will be visiting your site because they want something. The homepage showcase does just that on it’s own. If they want to find out a bit more about you then an ‘About Us’ page does that.
To add this widget to your own site go to Appearance > Widgets. Look for the Homepage Top widget area and add a text widget.
If you want a background image go to the Customizer and open the Header section and you will see the Homepage Header Background option and an opacity slider:
The colours in the CTA widget are set in the Customizer Colours section.
In the example above I’ve added a title and some links.