i heard if i join say my dad's credit card, i get his credit score and his credit limit. how exactly does this work and once i get his score and credit limit, that becomes my current score and i can build on that?

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This is how it works. When you open a line of credit you get what is called a trade line on your credit report. You can have good trade lines and bad trade lines. The credit bureaus look at the number of trades lines, payment history, and balances and they give you a score. If you pay your bills on time and you don't have high balances you will have a better score than someone who maxes out their credit cards and pays late all the time.

If you dad adds you as an authorized signer on his credit card, you will get a trade line on your credit report. You will not get his score because he probably has many trade lines that make up his score and you will only have one. There is a benefit to him doing this for you though. It will help you to establish credit. Sometimes if you don't have any credit banks won't give you loans or you won't be able to get a credit card, etc. This is a good way to give your credit a boost.

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