<prompt> Human: Hi PF...a bit about me: Im 17, in high school in the United States. I work full time over the summer to save money and have money for stuff. Anyways, would it be worth itlogical to sign up for a credit card and only use it for one small thing? I was thinking I would use it to pay for netflix, that way its predictable and I cant use it too much. I want to do it so it starts to improve my credit score so when the time comes to finance a car or whatever I have an established credit score. Would 8mo to anything to my credit score obviously I pay it on time every month? Any advice is welcome, am totally open to other ideas.  <response>: Yes, it is a great idea to start establishing credit. Youll need to wait until you turn 18 to apply. Many wait until college if youre planning to go as a number of credit-card companies have cards designed for college students. 