Answers for "laravel->start()"

php artisan serve

The full command works like this:

php artisan serve --host=<host IP address> --port=<port to use>

php artisan serve --host=127.0.0.1 --port=8080

how to install new project in laravel

You can create project by 2 ways:

First is installing it without defining version:
composer create-project laravel/laravel yourProjectName

Secondly you can install by defining version:
composer create-project laravel/laravel="VersionOfYourChoice" yourProjectName