how do credit cards work?

my advise is you need to build your credit, many thing in life now revolve around your credit rating including insaurance, potential jobs, and when you want to purchase a house or car. I started out when I was your age with store CCs. recently I bought about $6000 at the Maytag store a fridge, washer, dryer water, softener and I got 24 months same as cash which ment as long as I didnt miss a payment and payed it off within the 24 month time I got charged no interest(I actually paid it off in 12 months) the interest savings was over $1000, I did this when I bought a bunch of furniture and a $2500 TV from Best Buy...also you want a higher limit because your credit rating is based on your total limit on all your cards versus what you owe and you could cancel a card you dont use any more and your issac score will go down