You just pay the balance in full and it's interest free. If you have a problem controlling yourself/your spending it is a bad idea as it is essentially a loan.
Things like credit cards just worries me big time as in my younger days 30 odd years ago from the ages of about 18 to 30 i got myself into debt up to my eye balls from getting loans for stuff left/right & center which took me a good 10+ years to get out of
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