Difference between hook_services_services and hook_services_resources I'm doing this tutorial to get familiar with the concepts of the Services module. In that tutorial, you implement a custom service for the Services module. Therefore it uses hook_services_services. But there are other tutorials (e.g. An introduction to Drupal 7 RESTful Services) that use hook_services_resources for the same thing. So what is the difference?
The first article is incorrect, there is no hook_services_services() (at least not according to any documentation for the services module, nor in my experience).

The correct hook to use is hook_services_resources(). See the docs/services.services.api.php file included with the module for full details.