i am weak at economy, is it wise decision to use credit card?
Uh for me? No. I mean, why enslave yourself? Because thats how I view them. Since you said you are weak at economy, that could translate to mean, you do not have a control over how you spend, huh? Quite simple, ditch the use of credit cards because they can make your spending expensive, no thanks to all the interest being added when one makes a purchase on credit.