Work rule is nothing but some filter criteria based on that
list of Service Resource will be show for a Service Appointment. There can be
multiple Work Rules for a single Scheduling Policy.
This “Work Rule”
object is part of FSL managed package and it comes with multiple record types
to create different type of Work Rule for your Scheduling Policy.
Below are list of Work Rule’s record types,
Now going one by one (Why to use, when to use, what is the
limitation etc.).
(Click on the below links for details)