Explanation
These two permission sets give access to the Crew Management tool, which allows creating and managing crews and crew members. References:
https://help.salesforce.com/s/articleView?id=sf.fs_crews_overview.htm&type=5

hese two configurations allow adding a new status to the existing status flow for Service Appointments, and defining which statuses can transition to or from the new status. References:
https://help.salesforce.com/s/articleView?id=sf.fs_status_transitions.htm&type=5

Explanation
This option allows viewing the asset relationships on the Asset object, where the primary asset is the parent asset and the related assets are the child assets. References:
https://help.salesforce.com/s/articleView?id=sf.fs_asset_relationships.htm&type=5

Explanation
Updating the Resource as not available allows marking a resource as unavailable for a specific time period due to sickness, vacation, or other reasons[27. Selecting the affected Service Appointments and pressing
"Schedule" allows rescheduling multiple service appointments at once based on predefined criteria such as travel time or priority[28. Dragging and dropping the Service Appointments to other available Resources and running Optimization would reschedule service appointments manually and then run an optimization process that could override the manual changes[29. Asking the Customer Service Rep to call the customers and manually re-schedule for another day would not use the scheduling features of Field Service and could result in customer dissatisfaction or missed service level agreements. Changing the Scheduling Policy to "High Intensity" and activating the Background Optimization process would change the optimization criteria for all service appointments and run an optimization process in the background that could take a long time to complete[30. References:
https://help.salesforce.com/s/articleView?id=sf.fs_resource_absences_overview.htm&type=5
https://help.salesforce.com/s/articleView?id=sf.fs_schedule_service_appointments.htm&type=5
https://help.salesforce.com/s/articleView?id=sf.fs_global_optimization_overview.htm&type=5
https://help.salesforce.com/s/articleView?id=sf.fs_background_optimization_overview.htm&type=5

Explanation
Service Territories are used to group resources and service appointments based on geographic areas or other criteria. The recommended limit for service appointments per territory per day is 500 for optimal performance and user experience. References: https://help.salesforce.com/s/articleView?id=sf.fs_territories.htm&type=5
https://help.salesforce.com/s/articleView?id=sf.fs_limits.htm&type=5