The main repository, when it comes to Composer packages, is Packagist (https://packagist.org). It is a web service that we can access through our browser, open an account on for free, and start submitting our packages to the repository. We can also use it to search through already existing packages.
Packagist is generally used for free open source packages, though we can attach privateGitHub and BitBucket repositories to it in the same manner, the only difference being that the private repositories require SSH keys in order to work.
There are more convenient commercial installations of the Composer packager, such as Toran Proxy (https://toranproxy.com). This allows easier hosting of private packages, higher bandwidth for faster package installations, and commercial support.
Up to this point, we sliced our applications into six different Git repositories, one for core application and the remaining five for each module (catalog
, customer
, payment
, sales
, and shipment...