What are the different types of errors I might encounter in an Express.js application, and how can I handle them?

You might encounter various errors, including operational errors (e.g., invalid user input), programmer errors (e.g., syntax errors), and infrastructural errors (e.g., database connection issues). Handling them effectively involves using try-catch blocks within route handlers and middleware to catch exceptions. Operational errors can be handled by sending appropriate HTTP status codes and informative error messages to the client. Programmer errors should be caught during development and debugging. Infrastructural errors often require retries or fallback mechanisms and may require detailed logging and monitoring.