Linux Administration Cookbook

See also

In Debian and Debian-like distributions, the concept of a sites-enabled and sites-available directory has become commonplace. 

Theoretically, any sites you have on your box could go in the sites-available directory, and once you're happy with them, you create a symlink to the sites-enabled directory.

Personally, I find this setup a bit confusing and somewhat outdated for an automated world, but if that's your jam, then maybe the Debian way of doing things is for you. I won't judge.