Credit card is a brilliant invention to make life easier. If you know how to play the game.
Credit card only useful when transaction cannot be done using cash or debit card. Like purchasing books or things (you really need) online. In one condition: you have the real money and not thinking that "I'll use cred card for now and pay it next month because hopefully I will get more money next month" or "I buy this thing because I can pay it in 12-month installments, without interest."
Using cred card is giving you false impression about your financial situation. You will have wrong perception about how much money you actually have, how much money you actually spend and you would think that you could afford many things that you actually could not!
This false sense also will affect your life in the way you set priorities. When you fail setting priorities in life then you'll be successfully mismanaging your life.
So there's nothing fancy about having/using credit card.
*Important Notes for Customer Service offering credit cards: GO AWAAAAAAAYYYYY!!!
