How many credit cards should I own?

Related questions

1. Is a Bank of America credit card good?
2. Is it bad to apply for 2 credit cards a day?
3. Can I pay my Bank of America mortgage with a credit card?
4. Is it bad to have a lot of credit cards with zero balance?
5. Can I apply for 2 credit cards at once?
6. Does everyone have a credit score?
7. Does having multiple credit cards hurt your credit score?
8. What credit score do I need for Bank of America credit card?
9. What is my credit score if I have no credit?
10. Does Bank of America have credit cards?

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13. #airline
14. #people
15. #points