If you only pay minimums on monthly credit cards, you're probably overburdened already. If these problems are yours, be careful. Low rates aren't a good excuse to borrow more. Some purposes are better than others. Equally difficult to justify is a five-year loan on a car you'll sell in five or six years.
Good debt is productive.
It makes money, or at least saves you money. Using home equity to finance education can be smart. Presumably you're investing in a higher-income future, plus gaining tax advantages. Adding a second bathroom also can pay off. Even with low rates, interest adds up.