You want to declare a block of the type \Magento\Framework\View\Element\Template with a template named view.phtml in the layout XML.
What is the correct layout declaration for this?

You need to find all orders in the processing state. You have written the code:

When you run the code, you get the following exception:

How do you resolve the exception?

There are two different configurable products which both share one variation. The shared variation is represented by the same simple product.
A customer added both configurables to the cart with the same selected variation?
How will they be displayed?

You added a plugin declaration to MyCompany/MyModule/etc/di.xml:

What will be the effect of this declaration?

You are setting up a brand new Magento installation for a merchant who is migrating from Magento 1 to Magento 2.
Keeping in mind upgradability and the need to customize, which one do you choose?