A merchant is interested in setting different prices for the same products in different store scopes.
What do you reply to this inquiry?

Which entity in Magento supports scoped attributes?

You are building a report using complex SQL aggregations to locate the required data.
In what type of class do you put these SQL statements?

Your module, MyCompany_MyModule, is using the frontName mymodule. You need to locate the class responsible for the frontend path /mymodule/custom.
What file contains the controller class for the frontend path /mymodule/custom?

Assume that $collection is a new instance of a class that extends
Magento\Framework\Model\ResourceModel\Db\Collection\AbstractCollection, and $ids is an array of ids.
How do you select a list of records from the database where the record ids are in the $ids list?