composer config repo.packagist composer https://packagist.phpcomposer.com
Increase the installing speed via using Chinese repositories.
If you are not in China, just ignore it.
Go into the laravel root directory, excute the command
Than wait for composer to install dependency modules.
php artisan key:artisan
Application key [base64:xxxxxxxxxxxxxxxxxxxxxxxxxx] set successfully.
php artisan config:cache
Configuration cache cleared! Configuration cached successfully!
Now you can run your laravel 🙂