<prompt> Human: So Im 27 and have managed to stay relatively debt free my whole life. Just a couple of weeks ago, I took out a car loan to purchase a new car that I desperately needed. My dad had to cosign as my credit is not that great. As I move forward and make plans about buying a house one day, I would like to continue to build my credit, without taking on too much debt at any one time.My question is this: Do you guys think that a credit card is a good or the best way to go about this? If so, what would be the best way to use it solely for the purpose of building credit and not necessarily acquiring new things? If not, what would be a better method for building credit? I need a new guitar, which Im looking at as an investment as I will be using it to make money, so I am willing to drop up to 3500 for it. I was thinking about doing a payment plan for that, does that help build credit? Or should I use a credit card? Is that even possible? Any advice, suggestions or what have you would be greatly appreciated!  <response>: Do you guys think that a credit card is a good or the best way to go about this? Probably.If so, what would be the best way to use it solely for the purpose of building credit and not necessarily acquiring new things? Pay your credit card bills off in full every month. 