Building credit for newly U.S citizen?

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What is the best way to build my wifes credit once she becomes a US citizen? She has no credit history from here foreign country, my credit isn't great but not to bad. Would it be best to get her credit card and pay off or joint accounts to help mine and hers? dong that will it hurt her credit if mine isn't great? Any info would be greatly appreciated


Thank you

Building credit for newly U.S citizen?