You are adding an entry to the backend menu. To do so you open a core etc/adminhtml/menu.xml file as a reference. In the file you see the node:
What is the result of specifying resource=''Magento_Catalog::catalog''?
The constructor function for \Magento\Catalog\Model\Category contains this excerpt:
With the automatic dependency injection that Magento provides, how is the StoreManagerInterface resolved?
How do you add a new link into the My Account sidebar?
Assume that a customer's cart only includes one downloadable product.
What effect will it cause on the quote object?
A merchant requires the ability to configure contact information for their brick and mortar stores as a CSV file upload. The module already exists and contains an etc/adminhtml/system.xml file where the new field can be added.
How do you specify the class that will process the uploaded file?