What options are available for customizing and configuring Dynamics 365 Customer Service to meet specific business needs?

Can you explain the range of customization options available within Dynamics 365 Customer Service, including the ability to modify forms, workflows, and business rules?

We have modified and created forms without needing a code developer. We have several Flows running, which we do have a code developer for because I don’t have the expertise. I am also able to create business rules. Some simple, some a little more complex, all with a single form though.