There will come a day when you need credit. You may want to buy a home or a car and your credit rating will become very important to help make these dreams come true. One of the first things you will need to learn is the basic principle of money management, especially the ability to repay your creditors on time within the 30-day grace period they establish for you. Most people secure credit cards as the first way to establish credit in High School or College. Upon getting the credit card, usuall.