What is the best way to increase a credit score in US & what is the right way of doing if u have a credit card

Well the details needed is if some person has just a credit card and not a lot of other loans on their names, what should the person do so that the person can increase the credit score to a good level and not have any negative impact.
What all does the the person need to be careful of before doing so tht the credit score is not directly impacted.
Is there a shortcut way of doing something which could creatively help increase the credit score?

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