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What interface should a frontend controllers action implement?

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Question List (53q)
Question 1: What is the connection between product attribute sets and ca...
Question 2: Which two ways does Magento persist category relationships i...
Question 3: In layout files you can change al element's order on a page....
Question 4: What interface should a frontend controllers action implemen...
Question 5: A custom module needs to log all calls of \Magento\Customer\...
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Question 12: A module you are developing requires the addition of new rou...
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Question 18: You are updating a module to add extra functionality to the ...
Question 19: You are making some major adjustments to a core Magento clas...
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Question 23: A merchant sells shoes with multiple variations such as a co...
Question 24: A merchant requires the ability to configure contact informa...
Question 25: You have created a module to show manufacturer-list, Your cu...
Question 26: How do you add a foreign key to an existing table created by...
Question 27: A merchant tasks you to keep sales managers out of the syste...
Question 28: A merchant asks you to create a module that is able to proce...
Question 29: You are implementing a custom module MyModule, which provide...
Question 30: You are tasked with ensuring customers who log into the site...
Question 31: You are adding a new entry to the backend menu that appears ...
Question 32: You are working on a custom web API endpoint and have config...
Question 33: You added a plugin declaration to MyCompany/MyModule/etc/di....
Question 34: You need to add the Google Tag Manager (GTM) to every page. ...
Question 35: In a code review of a merchant's site you have discovered th...
Question 36: You need to add a new text attribute to all products in the ...
Question 37: You have created a module to show manufacturer-list, but in ...
Question 38: In a custom module you are adding a new field to the store c...
Question 39: You have configured an event observer to watch the checkout_...
Question 40: A custom module must make changes to the schema following ea...
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Question 42: How do you instruct Magento to enable a new module?...
Question 43: You are adding an entry to the backend menu. To do so you op...
Question 44: You are implementing a before plugin in MyCompany_Magic. It ...
Question 45: While reviewing a layout file named sales_order_view.xml you...
Question 46: The module MyCompany_MyModule will add a new page in the adm...
Question 47: There are two different configurable products which both sha...
Question 48: You are creating a new page layout for your custom module. W...
Question 49: You have created a module controller that responds to the fo...
Question 50: You have created a new product type, sample, and need to cus...
Question 51: \Magento\Sales\Model\Api\OrderRepositoryInterface::getList a...
Question 52: A custom module is performing an optimized custom query for ...
Question 53: There is a custom extension called MyCompany_MyModule. It ha...