Configuration: Check your .env file for any errors or typos, especially around the database connection settings. Make sure that your application is configured properly with correct environment variables, such as app key, APP_URL, and DB_* (database host, name, username, password) settings.

Routes: Ensure you are defining routes correctly and that they handle different HTTP methods. Also, check for duplicate route definitions which may cause unexpected behavior.

Middleware: Make sure your middleware is working properly by using artisan tinker or the command line to test the middleware functions.

Controllers: Check if all the controllers are properly defined and that they inherit from the correct base controller, use the correct methods (such as index, show, create, store, edit, update, destroy) and handle the incoming request correctly with appropriate validation.

Views: Make sure your views are correctly structured and can be rendered by the web application. Use Blade templating engine features to pass data from the controller to the view.

Authentication: Check if authentication is set up properly using Laravel's built-in authentication system. Test user login, registration, password reset etc.

Eloquent relationships: Ensure you have correctly defined your Eloquent models and their relationships with each other. Use the correct database schema and queries to access and manipulate data.

Error handling: Make sure you are properly handling exceptions in your code using try/catch blocks or other methods like error pages or logging.

Testing: Regularly write tests for your application to catch bugs early. Use tools like PHPUnit for testing.

Deployment: Ensure that the application is properly deployed on a server and that all dependencies are installed. Check if the website runs smoothly in production mode.

Security: Keep your Laravel version up-to-date, secure your application by enabling CSRF protection, hashing passwords, using HTTPS etc.