Reference:
https://docs.microsoft.com/en-us/powerapps/maker/portals/portal-templates
https://docs.microsoft.com/en-us/dynamics365/customer-service/embed-chat-widget-portal

Scenario:
Customers can select a meal when they make a reservation and can save the meal choices as a customer preference.
The company offers two types of meals: standard and vegetarian. Meal types can be temporarily unavailable. The airline is considering offering other meal types, such as gluten-free and low-sodium options.
In PowerApps Option set is one of the field types you can use in your Entity. The information type that Option Set stores is a list of text values. And here comes the Option Set advantage - once you define its text values you can centrally managed it.
Example:

Reference:
https://michalguzowski.pl/how-to-work-with-option-set-in-powerapps/

Scenario: Information about each machine produced must be transferred to Dynamics 365 Field Service.
Use the Microsoft Dataverse connector when connecting to the Microsoft Dataverse used for Microsoft Dynamics 365 Sales, Microsoft Dynamics 365 Customer Service, Microsoft Dynamics 365 Field Service, Microsoft Dynamics 365 Marketing, and Microsoft Dynamics 365 Project Service Automation.
Reference:
https://docs.microsoft.com/en-us/powerapps/maker/canvas-apps/connections/connection-dynamics-crmonline

Reference:
https://docs.microsoft.com/en-us/dynamics365/field-service/configure-schedule-board
https://docs.microsoft.com/en-us/azure/iot-hub/about-iot-hub

Explanation:
Box 1: Microsoft Power Automate, Microsoft Dataverse connector, and Microsoft 365 Outlook connector Use Microsoft Dataverse as the data source.
While Power Automate is a robust tool with ever-expanding capabilities, it also handles simple tasks with grace. A universal business need for many organizations is the ability to automate email notifications based on certain criteria: an opportunity is won, send an email to the sales manager; a case is closed, send an email to the customer; a work order is completed, send an email to the customer.
Power Automate can easily accommodate this using the Microsoft 365 Outlook connector.
Box 2: Microsoft Power Automate, Power Bi data alerts, and Microsoft 365 connector Data alerts in the Power BI service: Set alerts to notify you when data in your dashboards changes beyond limits you set.
Box 3: Microsoft Power Automate, Power BI, Power Apps, and Microsoft Dataverse connector Reference:
https://www.velosio.com/blog/2021/01/27/tracking-emails-the-right-way-with-power-automate/
https://docs.microsoft.com/en-us/power-bi/create-reports/service-set-data-alerts