Check out example codes for "symfony new project". It will help you in understanding the concepts better.

Code Example 1

# use the most recent LTS version
$ symfony new my_project_name --version=lts

# use the 'next' Symfony version to be released (still in development)
$ symfony new my_project_name --version=next

# you can also select an exact specific Symfony version
$ symfony new my_project_name --version=4.4

# The --full option installs all the packages that you usually need to build web applications.

Code Example 2

/usr/bin/composer create-project symfony/skeleton /home/handwork/symfony
#create symfony projet de base
# un dossier cacher du meme nom du projet serai creer

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