Database you can setup adding below line to .env created file
DATABASE_URL=mysql://root:root@127.0.0.1:8889/video_app?serverVersion=5.7
To allow symfony to work with Apache:
composer require symfony/apache-pack
To install npm packages
npm init
npm install
To minimize CSS and JS with Webpack encore, https://symfony.com/doc/current/frontend/encore/installation.html create configuration file and run:
./node_modules/.bin/encore production
or
./node_modules/.bin/encore dev --watch