This lesson will explore the use of EntityFieldQuery to retrieve lists of entities from Drupal without directly querying the database which can be problematic in a system where the underlying schema can change depending on configuration settings in the user interface. Again focusing on writing code that will work with any entity in Drupal and isn't hard coded to your particular setup.
Check your version
This video covers a topic in Drupal 7 which may or may not be the version you're using. We're keeping this tutorial online as a courtesy to users of Drupal 7, but we consider it archived.