Explanation:
Box 1: Service activity
Avoid disruptions in service by making sure that your resources are scheduled optimally and efficiently. Using Scheduling in Customer Service Hub, you can plan and schedule service activities for your customers by bringing together all your resources.
Note: Create a service activity
A service activity is defined to look for the next available time slot to schedule the service and align resources as per requirement.
Box 2: Resource category
Create resource groups
The resources are aligned in resource groups or resource categories.
For example, Bert Hair and Gilda Moss are grouped as Technicians and Bike repair workbench - 1 and Bike repair workbench - 2 are grouped as Workbenches.
With bookable resource categories, you can group your bookable resources by type. For example, you can create categories like technician, supervisor, subcontractor, vehicle, or equipment.
Reference:
https://docs.microsoft.com/en-us/dynamics365/customer-service/basics-service-service-scheduling
https://docs.microsoft.com/en-us/dynamics365/customer-service/resource-categories-service-scheduling