Understanding a credit card

Summary

I just got a credit card in BC, im 19, working a part-time job, and plan to go to university the next academic year. But some things I don't understand. I know that you have a set spending limit for each month, some cards offer points, and you have to pay after purchases to uphold your credit score, or else you get charged extra interest. But who do I send the money to? (Im with rbc) How can I calculate my credit score? Can I just send the money as soon as i make the purchase? Is there an au

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