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 does Magento store customer address attribute values?

Assume that a customer's cart only includes one downloadable product.
What effect will it cause on the quote object?

You need to add a new text attribute to all products in the Magento store. When this attribute is displayed on the
product page, its values must be different depending on the selected language.
Keeping simplicity in mind, how do you add this attribute?

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?