In this article, we'll compare Drupal 9 vs Drupal 10. We'll also cover some of the key differences between these two versions.
Composer
We can install the latest version of drupal9 using the following command.
composer create-project drupal/recommended-project my_site_name_dir
This will create a project in 'my_site_name_dir' and automatically execute composer install to download the latest stable version of Drupal and all its dependencies.
Your 'my_site_name_dir' will contain files that should be outside of your web root and not accessible by the web server. The web root will be 'my_site_name_dir/web'.