You have created a new block and will be adding this block on every page. The block contains user-specific
information and cannot be cached. The block is added to the default.xml with:

What does this accomplish?

How many shipping addresses may be selected for an order during the checkout process?

You are working on a Magento store which will be selling in two countries. Each country has its own set of payment methods.
How do you organize the project to support this requirement?

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 added a new constructor argument to an existing action controller class.
When you reload the page you get a PHP error that the wrong argument is passed to the class.
How do you fix this?