Explanation
Custom gantt filters are filters that allow dispatchers to view service appointments based on specific criteria such as status, priority, or custom fields[67]. Creating a custom gantt filter would allow providing a view of emergency work that is only visible to dispatchers by setting up criteria such as status equals emergency and sharing the filter with dispatchers only[68]. Custom lightning component is a component that allows developers to create custom user interfaces using Lightning Web Components or Aura Components[69].
Creating a custom lightning component would require coding and would not leverage the existing gantt chart functionality. Custom report in a private report folder is a report that allows users to view data based on specific criteria such as objects, fields, filters, or charts[70]. Creating a custom report in a private report folder would not provide a view of emergency work on the gantt chart and would not allow dispatchers to schedule or reschedule service appointments. Custom list view is a list view that allows users to view records based on specific criteria such as filters, fields, or sorting[71]. Creating a custom list view would not provide a view of emergency work on the gantt chart and would not allow dispatchers to schedule or reschedule service appointments. References: https://help.salesforce.com/s/articleView?id=sf.fs_gantt_filters.htm&type=5
https://help.salesforce.com/s/articleView?id=sf.fs_gantt_filters_create.htm&type=5
https://developer.salesforce.com/docs/component-library/documentation/en/lwc
https://help.salesforce.com/s/articleView?id=sf.reports_builder_overview.htm&type=5
https://help.salesforce.com/s/articleView?id=sf.customize_listviews.htm&type=5

Explanation
A quick action is used to create a record from another record with predefined field values. By defining a quick action to create a new service appointment from an existing one, the technician can easily create an additional visit to complete unfinished work.
References: https://help.salesforce.com/s/articleView?id=sf.fsl_quick_actions.htm&type=5 Work types are used to define the standard duration and skills required for a specific type of work. They can also include the required products that are needed for the work. By including the required products in the work type, the system can automatically add them to the work order when the work type is selected.
References: https://help.salesforce.com/s/articleView?id=sf.fsl_work_types.htm&type=5

Explanation
This option allows creating a record to request products from another inventory location and adding product request line items for each product requested. References:
https://help.salesforce.com/s/articleView?id=sf.fs_product_requests_overview.htm&type=5

Explanation
This option allows booking appointments, creating work orders, and viewing work types and work rules, which are the tasks that call center agents are responsible for. References:
https://help.salesforce.com/s/articleView?id=sf.fs_permission_sets.htm&type=5

Explanation
Skills are used to define the level of expertise that a resource has for a specific type of work. Skill requirements are used to define the level of expertise that a service appointment needs. Resource skills are used to assign skills to resources. By setting up these components, the system can match service appointments with resources based on their skills.
References: https://trailhead.salesforce.com/en/content/learn/modules/field_service_basics/field_service_skills