How do I handle validation errors in Laravel using the error handler?

Laravel automatically handles validation errors by redirecting the user back to the previous page with the errors in the session. However, you can customize this behavior in the `render()` method of `app/Exceptions/Handler.php`. You can check if the exception is a `ValidationException` and then customize the error response, perhaps returning a JSON response with the validation errors instead of a redirect, depending on the request type (e.g., an API request).