How does React Fiber handle errors?
React Fiber introduces a new error-handling mechanism called Error Boundaries, which allows developers to catch errors in the component tree and display a fallback UI. Error Boundaries are components that implement the componentDidCatch method or use the static getDerivedStateFromError method. When an error occurs within a component tree, React will look for the nearest Error Boundary and delegate error handling to it, preventing the entire application from crashing.