When building complex UIs, you will often need to compose multiple components together. Lit makes this straightforward by allowing you to nest custom elements, pass properties, and handle events between them. This approach enables you to break down your interface into focused, reusable pieces. For example, a parent component can render several child components, each responsible for a specific part of the UI. You can pass data to children using properties and respond to their events using custom event listeners.

Effective strategies for component composition include keeping each component focused on a single responsibility, which makes code easier to maintain and reuse. Use properties and events for communication, rather than tightly coupling components together. This separation of concerns ensures that changes to one part of your UI do not ripple unnecessarily through the rest of your codebase. By thinking in terms of small, composable units, you can build UIs that are both flexible and robust, making it much easier to update or extend features in the future.