Good debt, like mortgages or student loans, can be seen as an investment and typically has less impact on credit scores. Bad debt, including credit card debt, can be harmful financially and to credit scores, particularly due to high credit utilization. Paying off bad debt can lead to a credit score boost, while good debts should be managed responsibly to avoid negative impacts on credit scores. Understanding the difference between good and bad debt can help in creating a strategic debt repayment plan to improve financial health and credit scores.