This screencast demonstrates the incredible power of rules to make functional changes to your Drupal site without requiring PHP code. And along the way, you'll understand why Drupal Commerce is built on top of Rules (so you can do things like this) and even understand how Commerce Stock works.

We're going to look at how you use rules and take a little detour to show you how the Commerce Stock module works. You can use rules to create a rule that creates a "re-order" threshold that will send a notification to the screen or email. The idea is a quick introduction to Commerce Stock and how to tweak it's behavior using Rules.