What are the different types of errors I should be prepared to handle with Mongoose in NestJS?

You should be prepared to handle various types of errors with Mongoose in NestJS. These include connection errors (e.g., database unavailable), validation errors (e.g., invalid data), data conversion errors (e.g., incorrect data types), and unexpected errors during database queries. Mongoose provides error types like `MongooseError`, `ValidationError`, and potentially custom error types derived from these. It's important to catch and handle each of these types appropriately to provide a robust application.