More than any generation before them, millennials have grown up in a world built on credit and borrowing. For many of them, debt has become a way of life. And for many, especially those who financed an education with credit, they may already find themselves carrying a significant amount of long-term debt and are having difficulty dealing with it. Understanding how to handle this debt will be an important, if not essential, part of how they fare in the coming years. So here are some general rules to follow for millennials hoping to better manage their debt.