a. Your credit card maybe cancelled automatily by your credit card company.

    Since your current credit card company will check your credit history regularly, if they find you total credit is excess too much for your household income, they will cancell the credit card, even you still have debit on it.

b. Having lots of credit cards does not mean you have great credit score/history.

    The total credit line is the measurment. and The lower APR means you have the better credit history.

C. It is better to keep your first credit card, because it is the prove that your credit history was building up, and normally that credit company is the one you have best credit history.

D. Don't apply too much credits cards at one time, since the credit checking will affect your score.

E. Apply Visa, Master as your First/early creadit card, Amex / Disc are very good credit card, but first, it cannot use anywhere, second, it is  hard to apply and come with a higher APR than standard.

6.The rule of choice a GOOD credit card:

a. Rebate (the points/mile reward is useless, and the cash rebate is the best, like Citi Divid, Chase Reward, AmEx true earning) 

b. APR (very important, you never can promise you would pay off the debit on time for full amount. )

You can call in for request credit increase or lower the APR.

Cheat by Credit Card Company:

1. No Annual Fee for the first year

2. Just first 3-12 months 6% rebate

3. the great amount rebate just in particular location/ gas station (For example, BP Credit card only get 6% at BP Gas, not others, Citi Gas Station rebate, only at the gas pump)

4. APR for limit period (very common)

You will have a great credit score/history as long as follow this rule: 

you spend, and you pay off. (at lease pay mini balance on time)

keep your finance on control:

1. keep less credit cards (mostly 3).

   I had over 15 credit card at most.

2. Keep lower credit limit.

   Lower credit limit, doesn't mean your credit score is bad. You even can reject or request low the credit limit, it won't reduce ur score.

   In fact, you don't have so much chances to use a credit card for over $5000 dollar transation at one time, except for business.

3. Never take cash out from your credit card, (the APR is counting daily, and plus transation fee)

4. Keep checking your credit card activities.

5. Call Credit Company periodly to request lower ur APR or ask any prom.(Like upgrade, get a non-transation fee, low APR balance transfer)

About Credit Card Payment:

, payment due date, unbilled activity:

    Payment circle: it is normally a 30 day-circle, and decided by bank.

    For example: you credit card circle date is from 3/25 to 4/25, and your payment due date is 5/20. (The payment due date is normally around one week before your next closing day.)

     The unbilled activity is after 4/25 and before the next closing date/ the date you check your credit card bill.

2. Pay online:

    Normally, you can not pay twice within 24 hours.

    You can not overpay. For example: You have you April statement for $400 (activity until 4/25).You can not pay over $400 for the unbilled activity till your next statement.

3. Late charge:

    Late charge is base on your balance.

    For example: $10 for balance below $100, $20 for balance from $100 to $500, $40 for balance from $500, etc.

4. Interest rate:

    APR is annual percentage rate Due to the banks charge you daily, the actual rate is higher.