Credit cards

According to The Bogleheads' Guide to Investing,  the financially sound use of credit and debit cards takes advantage of the convenience such cards can provide, as long as one always pays the balance due each month, avoiding interest charges. Some credit cards provide programs that rebate a percentage of purchases back to the cardholder. The following tables provide information on credit card cash rebate programs for selective credit card issuers.

Caveat: These tables are intended as examples to show the variations among card issuers. They are not recommendations. Read all of the Terms and Conditions in the card issuer's agreement, as exceptions can be subtle and potentially influence a decision.

Credit report
The Fair Credit Reporting Act (FCRA) requires each of the nationwide consumer reporting companies — Equifax, Experian, and TransUnion — to provide you with a free copy of your credit report, at your request, once every 12 months.

A credit report includes information on where you live, how you pay your bills, and whether you've been sued, arrested, or filed for bankruptcy. Nationwide consumer reporting companies sell the information in your report to creditors, insurers, employers, and other businesses that use it to evaluate your applications for credit, insurance, employment, or renting a home.

AnnualCreditReport.com is a centralized service for consumers to request free annual credit reports. It was created by the three nationwide consumer credit reporting companies - Equifax, Experian and TransUnion - and is the only service authorized for this purpose.
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Investopedia links

 * Credit Card Tutorial
 * Understanding Credit Card Interest
 * Everything You Need to Know About Credit Card Rates
 * Six Major Credit Card Mistakes
 * 7 Tips For Closing A Credit Card
 * 6 New Credit Card Regulations That Benefit You
 * Breaking Down Credit Card Fine Print