Go to Sites > Catalog > Categories. Make sure you have at least one Category in addition to the default “root” category header. Only Categories set to the “root” Parent Category Page will display on the Home page. Also, a Category needs at least one Product. Products need a Pricing Engine/Site Group pairing to be set and saved.
Remember that changes to the Site can take as long as 3 minutes to display in the website. If you want to speed up the process of seeing changes in your site, enter /clearcache at the end of the URL (example: website.com/clearcache).