Let’s just call this month a big fat “How NOT to Use Credit Cards.” Have you seen pins like the one on the right in your Pinterest feed? Beware, advertisers hire wily copywriters to separate you from your money. Even though this pin says transferring a balance is ingenious, and even though I did exactly what it says, I have to disagree with the “ingenious” part. No, I’d have to say it’s the slippery slope of managing your credit. Let me tell you why: You’ve just opened yet ANOTHER credit card. Welcome…