To maintain a good rating, you should borrow only when you really need to and be sure to return the borrowed funds on time. Full repayment of the credit card debt before the report date will allow the bank to take into account the zero balance and not worsen your credit history.
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It is useful to monitor your data in the credit history bureau. A free report once a year will help to detect errors or fraudulent attempts in time. If inaccuracies are found, they should be promptly disputed and corrections made.
When planning large purchases or a home loan, you should not create new encumbrances shortly before submitting an application. A clean history, stable income, and a minimum number of active loans increase the chances of approval and better interest rates.