DL Laravel environment construction method (Linux)

[Prerequisites] The Lamp environment with composer installed has been built normally.

You can run the Laravel project downloaded from github for the time being Set up to use.

1. DL the laravel project

Let's access GitHub and download a suitable Laravel project for the time being [project name testlaravel]

2. Install composer

I get an error like this when I try to launch serve for a DL testlaravel project.

/var/www/html/testlaravel$ php artisan serve
I get this error ↓
PHP Warning:  require(/var/www/html/testlaravel/vendor/autoload.php): failed to open stream: No such file or directory in /var/www/html/testlaravel/artisan on line 18

Warning: require(/var/www/html/testlaravel/vendor/autoload.php): failed to open stream: No such file or directory in /var/www/html/testlaravel/artisan on line 18
PHP Fatal error:  require(): Failed opening required '/var/www/html/testlaravel/vendor/autoload.php' (include_path='.:/usr/share/php') in /var/www/html/testlaravel/artisan on line 18

Fatal error: require(): Failed opening required '/var/www/html/testlaravel/vendor/autoload.php' (include_path='.:/usr/share/php') in /var/www/html/testlaravel/artisan on line 18

Install composer because the Laravel project cannot be started because Composer is not included.

/var/www/html/testlaravel# composer install

3. When the composer installation is complete

Let's launch the testlaravel project as soon as the composer installation is complete

 /var/www/html/testlaravel# php artisan serve

It does get up, but I always get a 500 server error here.

4. Set the .env file and APP_KEY

The .env file is not created in laravel as a cause of the error here A server error has occurred due to the fact that APP_key has not been created.

First, let's create an .env file. Enter the following in the command

cp .env.example .env

At this stage, the env file has not been created yet, so let's create APP_KEY.

php artisan key:generate

Enter vi .env and if the .env file is created successfully, you are done. ↓ This is the guy

APP_NAME=
APP_ENV=
APP_KEY=
APP_DEBUG=
APP_URL=

LOG_CHANNEL=

DB_CONNECTION=
DB_HOST=
DB_PORT=
DB_DATABASE=
DB_USERNAME=
DB_PASSWORD=
(Omitted below)

If you launch the testalaravel project again and the usual page appears, it is a success.