5 things never to put on a credit card

Never put more consumer credit debt on credit cards i.e. "robbing from Peter to pay Paul", unless.....it's at a much lower rate and will save you money in the long run. The art of FICO scores is all about managing debt and working within the parameters to raise your score. Most have no clue what factors are involved in their credit score until they need a large loan and find out they are excluded from the sweetheart deals. Things like the number of open accounts, the age of the accounts, the utilization rate of each card and others can have a great impact on FICO score. The obvious one is late or missed payments and they stay on your record for 7 years, but that's the extent of what a majority know about credit scores. Something as simple as getting a new credit card can be bad depending on the circumstances. If you have a card with a $ 10,000 limit and you exceed the recommended 30 % utilization rate ($3000) by purchasing an item, you are again penalized. Anyone that has cards and wants to have a decent score should take 10 minutes to read up on the factors to better utilize their credit. Thanks for sharing.
http://www.myfico.com/credit-education/whats-in-your-credit-score/

I don't think one should put anything on a credit card unless they have the discipline to pay it off every month, but these five things could be especially harmful. It's much easier to get in trouble with someone else's money.