PPowerApps Portals mainly used for engaging with Customers and Partners.
PowerApps Portals allow organizations to create websites which can be shared with users external to their organization either anonymously or through the login provider of their choice like LinkedIn, Microsoft Account, other commercial login providers.
You can refer below links for more info.
You can view videos from below playlist:
Also, You can refer below blogs
Also @OliverRodrigues blog
This training provides practical hands-on experience in creating Power Apps solutions in a full-day of instructor-led App creation workshop.
Come together to explore latest innovations in code and application development—and gain insights from experts from around the world.
At the monthly call, connect with other leaders and find out how community makes your experience even better.