Laravel can't run web server after installing example app. What could be the possible causes and solutions?

When installing an example app in Laravel and encountering issues with running the web server, there are several possible causes and solutions to consider. Here are some common scenarios and their corresponding remedies:

Incorrect installation: Ensure that Laravel and its dependencies are installed correctly. Check the Laravel installation guide to make sure you have followed all the steps properly. Reinstall Laravel if necessary.
PHP version: Laravel requires a specific version of PHP to run. Check your PHP version by running php -v in your terminal or command prompt. If it's not the required version, you may need to install a different version of PHP or configure your server to use the correct one.
Apache or Nginx configuration: Laravel can be run on Apache or Nginx web servers. Make sure that the web server is properly configured to serve Laravel applications. Check the Laravel documentation for the specific web server you are using and follow the instructions for configuring it.
.env file: Laravel uses an .env file to store environment variables. Make sure that the file exists in the root directory of your Laravel application and that it contains the correct variables. You can create a new .env file by copying the .env.example file and renaming it.
Database configuration: Laravel requires a database to store application data. Make sure that the database is properly configured in the .env file and that it is accessible from your Laravel application.
Composer dependencies: Laravel relies on several Composer dependencies to function properly. Make sure that all dependencies are installed and up-to-date by running composer install in your terminal or command prompt.
Permissions: Laravel requires certain permissions to function correctly. Make sure that the ownership and permissions of the Laravel application directory and its contents are set correctly.
Firewall or security software: Firewall or security software may be blocking Laravel from running. Make sure that your firewall or security software is configured to allow traffic to the Laravel application.
Routes: Make sure that your routes are properly defined in the routes/web.php file. Check the Laravel documentation for information on defining routes.
Caching: Laravel uses caching to improve performance. Make sure that the cache is cleared by running php artisan cache:clear in your terminal or command prompt.

If none of the above solutions work, you may need to seek further assistance from the Laravel community or consult the Laravel documentation for more detailed troubleshooting steps.