The only superior general-purpose credit card that I know of is Citi DoubleCash, which offers 2% cashback on everything and permanent 0% interest if used correc

The only superior general-purpose credit card that I know of is Citi DoubleCash, which offers 2% cashback on everything and permanent 0% interest if used correctly with Amazon purchases. (The best Amazon credit card is Amazon's own, because of the 5% cashback. But even it doesn't offer DoubleCash's 0% interest option.)