Install an existing Laravel project

• Update .env file → database

• $ db name
• $ db password 

Project error →

[ SQLSTATE[HY000] [1045] Access denied for user 'root'@'localhost' (using password: YES) ]

( if project create on another root,password phpmyadmin environment so we also have to use root,password for our phpmyadmin )

db error→

mysqli_real_connect(): (HY000/1045): Access denied for user 'root'@'localhost' (using password: NO)

After charge → XAMPP\phpMyAdmin\config.inc.php → /* Authentication type and info */
Charge default → ‘ user ‘ ,’ password ‘

• Install the dependencies with Composer.

• # cd in your project directory
• $ composer update

            or

• $ composer install
• $ composer dumpautoload -o

• Generate the key for your environment file, it will define the value for 'APP_KEY='

• $ php artisan key:generate

• Finish by clearing the config and generate the cache.

• $ php artisan config:clear
• $ php artisan config:cache

• Time to check your site, depending on your environment, for development, the easiest way is to use Artisan.

• $ php artisan serve

[project error]

[Symfony\Component\Debug\Exception\FatalThrowableError]
Class 'Khill\Lavacharts\Laravel\LavachartsServiceProvider' not found

• Change → ( Comment ) → [config/app.php]

// Khill\Lavacharts\Laravel\LavachartsServiceProvider::class,
// Khill\Lavacharts\Laravel\LavachartsFacade::class,

( Remove ) → ,"khill/lavacharts" : "3.0.*" → [composer.json]

[project error]

count(): Parameter must be an array or an object that implements Countable

[database error]
Warning in ./libraries/sql.lib.php#613
count(): Parameter must be an array or an object that implements Countable

• [ Php7.2 error ] → Downgrade to php7.1

      Or

• Without artisan server
• Locate the Project → XAMPP → htdoc Folder 
• Run → localhost/Project_Name/public/

For More https://colorfield.be/blog/install-existing-laravel-project