Handling credit card offers
If you're receiving credit card offers in the mail, shred them. Then, demand to be taken off the credit company mailing lists. You can halt unsolicited credit card offers for a full five years by calling the Consumer Credit Reporting Industry's "opt out" number at 888-567-8688 and following the voice prompts.
Credit cards are an easy trap
Companies that pre-approve you for credit cards aren't doing you a favor. Nor are they complimenting you. To them, you are a person who fits a certain risk profile category. They know you may or may not default on your agreement with them. If you do, it opens the door for late fees and default-level interest rates. At that point, you've become a cash cow for these creditors.
Acquiring five or six credit cards and using them frequently is like giving control of your financial future to strangers. The reason people fall into this trap is because the credit card companies make it so easy for them.
A better credit building plan
Financial counselors say that using three or four accounts responsibly is the way to build a credit history. You don't need to hurry the process, though. Even using just one or two credits cards sensibly for a couple years following graduation will send a positive message about you to mortgage lenders and others.