You can apply for a student credit card since you are currently a student. After graduation, you can keep using your student card. If you want a cash back credit card, you should consider the Discover it® Student Cash Back card. The card offers 1% cash back on all purchases. You can even get 5% cash back if you enroll in rotating categories every quarter. Also, shopping via Discover Deals will bring you from 5% to 20% cash back.
If you are planning to apply for a credit card after your graduation, you should consider credit cards for people without credit history.
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All rates and fees, and other terms and conditions of the products mentioned in this article/post are actual as of the last update date but are subject to change. See the current products' Terms & Conditions on the issuing banks' websites.