How To Change Core Functionality In Magento2 HD

Today we’ll learn how would you go about changing functionality in Magento2 in a proper way. It’s a terrible idea to alter the original source code directly, because you won’t be able to upgrade the system later, and you create a big mess in your application where you don’t even know what’s original code and what’s added. Instead, similarly to Magento 1, Magento2 allows you to change, or extend, the behavior of any original method in the codebase, without even touching it, and that’s exactly what we’re going to explore in this lesson. http://mageclass.com/screencast-how-to-change-core-functionality-in-magento2/