During a code review of a module MyCompany_PaymentCurrencies you see a configuration field declared in the file etc/adminhtml/system.xml:

What is the consequence of the attribute showInStore being set to 0?

What scopes are available for customer attributes?

You are writing a customization for the customer module. You need to make sure the configuration files from your module are loaded after the customer module's configuration.
Where should the dependency be declared?

What is the connection between product attribute sets and categories?

A module declares the route:

What is the layout handle of the storefront path /custom/feature/?