Reusable Angular components are essential for building scalable projects and achieving code reusability.To create truly reusable components, it is important to structure them properly under a shared folder and make them configurable through inputs.By combining @Input and @Output decorators, components can be made reactive and flexible, allowing for communication with the parent component.To enhance reusability, Angular's testing tools can be used to test input/output behavior and DOM updates of the components.