Which file should a developer use to set the default value when creating configuration fields for admin?
When creating configuration fields for admin, the default value should be set in the etc/config.xml file.
Which feature should a developer enable if a B2B buyer wants to negotiate the product price from a shopping cart?
If a B2B buyer wants to negotiate the product price from a shopping cart, the developer should enable the B2B Quote feature. This feature allows buyers to request a quote for a specific product directly from the shopping cart. Reference: https://docs.magento.com/user-guide/configuration/sales/quote.html
How can a developer prioritize a plugin's execution, if possible?
To prioritize a plugin's execution, a developer can use the 'sortOrder' property by specifying a lower value than the target plugin. The lower the sortOrder value, the higher the priority. Reference: https://devdocs.magento.com/guides/v2.4/extension-dev-guide/plugins.html#declaring-a-plugin
A developer is making customizations in the checkout, and access to the quote's shipping address is needed. Which file provides the shipping address of the current quote?
The file Magento_Checkout/Js/model/quote provides the shipping address of the current quote. It contains the necessary methods to retrieve and manipulate the quote's shipping address data.
Which directory contains language packages?
Language packages are located in the 'i18n' directory in Magento. Reference: https://devdocs.magento.com/guides/v2.4/config-guide/cli/config-cli-subcommands-i18n.html