To display different content on the homepage based on whether the customer is logged in (registered) or is a guest (unregistered), the recommended approach is to use Content Slots configured for different customer groups. Salesforce B2C Commerce Cloud allows the configuration of Content Slots to display specific content based on various criteria, including customer groups. By setting up these slots to differentiate between registered and unregistered users, the site can dynamically display tailored content to users based on their logged-in status. This method leverages the platform's built-in capabilities for personalizing user experience without the need for extensive custom coding.