In a Laravel application, troubleshooting entails locating and fixing problems that might come up during development or deployment. An intermediate tutorial covering typical troubleshooting situations in a Laravel application may be found below:

1. Check Laravel Logs:

• Laravel logs errors and exceptions in the storage/logs directory.
• View the logs to identify any issues: storage/logs/laravel.log.

cat storage/logs/laravel.log

2. Debugging:

• Use dd() or dump() functions for quick debugging.

• Utilize Laravel’s debugbar package for a more detailed debug view.

3. Database Issues:

• Ensure database credentials are correct in .env file.
• Run migrations: php artisan migrate.

php artisan migrate

• Check for database-related errors in Laravel logs.

cat storage/logs/laravel.log | grep "database"

4. Composer:

• Run composer install to install/update dependencies.

composer install

• Check for any package-related issues in the composer.json file.

5. Caching:

• Clear the application cache: php artisan cache:clear.
• Clear the configuration cache: php artisan config:clear.

6. Environment Configuration:

• Ensure .env file is correctly configured.
• Clear configuration cache after changes: php artisan config:cache.

7. HTTP Requests:

• Inspect incoming request data:

8. Routing:

• Check route definitions in routes/web.php:

9. Session/Cookies:

• Clear session cache:

php artisan session:clear

10. Server Configuration:

• Verify server configurations.

11. Testing:

• Run tests using PHPUnit:

php artisan test

12. Laravel Telescope:

• Install Laravel Telescope:

composer require laravel/telescope --dev
php artisan telescope:install

13. Third-party Packages:

• Check for updates and documentation of third-party packages.
• Verify compatibility with the Laravel version.

14. Laravel Horizon (Queue Issues):

• Monitor queues using Laravel Horizon.
• Check if your queue workers are running: php artisan queue:work.

php artisan horizon

15. Laravel Dusk (Browser Testing):

• Run Dusk tests:

php artisan dusk

16. Server Logs:

• Check server logs for additional issues.

17. Deployment Checklist:

• Ensure correct file permissions, set the environment, clear caches, run migrations and seeders.

18. Security:

• Regularly update Laravel and dependencies.
• Follow Laravel security best practices.

19. Laravel Telescope:

• Use Laravel Telescope for application debugging and monitoring.

20. Monitoring and Logging:

• Implement monitoring tools and log aggregation systems.