As a mortgage broker, the best way to improve credit for buying a house involves several key steps. First, ensure all existing debts are paid on time to avoid late payments that negatively impact credit scores. Second, aim to reduce credit card balances to below 30% of their limits as lower credit utilization ratios can boost credit scores. Third, avoid opening new lines of credit shortly before applying for a mortgage as multiple inquiries can temporarily lower scores. Fourth, check credit reports for errors and dispute any inaccuracies promptly. Fifth, consider becoming an authorized user on a family member’s credit card with a long history of on-time payments to potentially benefit from their positive credit behavior. Lastly, consult with a credit counselor, like MR CREDIT LLC, or mortgage professional for personalized advice tailored to individual financial situations to optimize credit readiness for a mortgage application.