To make use of a grace period, pay your bills in full each month by the payment due date. Not all credit cards have a grace period. When a credit card does not have a grace period, there is no way to avoid paying interest on your purchases. In addition, you won't be charged any interest if you pay off your balance in full during the grace period of that cycle. Try to pay off your balance in full each month to maintain the grace period and avoid paying interest.
Most cards charge a special fee when a cash advance is taken out.
Most cards do not have a grace period on cash advances. This means you pay interest every day until you repay the cash advance, even if you do not have an outstanding balance from the previous statement. On some cards, the interest rate on cash advances is higher than the rate on purchases. Be sure you check the details on the contract sent to you by the card issuer. It is usually much more expensive to take out a cash advance than to charge a purchase to your credit card.