These two objects are required when configuring an optimization job, as they define the scope and the criteria for the optimization process. References:https://help.salesforce.com/s/articleView?id=sf.
fs_optimizer_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

Drip feed is a feature that automatically dispatches service appointments to resources based on predefined criteria and time intervals. By using dripfeed, the system can handle same-day service appointments and adjust the technician's schedule accordingly.
References: https://help.salesforce.com/s/articleView?id=sf.fsl_drip_feed.htm&type=5

These two options allow creating skills that represent qualifications and assigning them to service resources and work orders, and using a work rule to match skills when scheduling appointments. References:https://help.
salesforce.com/s/articleView?id=sf.fs_skills.htm&type=5