What is the best practice to prevent 'error_code 401' in a Telegram bot's code?

The best practice to prevent 'error_code 401' is to securely store your bot token and ensure it's loaded correctly into your application's configuration. Avoid hardcoding the token directly into the source code. Use environment variables or a secure configuration management system. Implement robust error handling to catch '401' errors and log them with sufficient detail for debugging, and consider implementing a mechanism to alert you if such errors occur frequently.