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Welcome to credit and to the boards. It is best to keep the reporting balance smallish, under 29% is fine for now with this one card. You will learn plenty more about optimising your score on down the road in your credit journey.
Don't charge more than you can afford to pay off, and don't spend on frivioulous things just for the sake of using the card, but do use it frequently for your normal spend so Cap 1 will see you can handle the bill. You can charge it up and pay it off more than once a month if you usually spend that much. It will improve your chances of getting a better CLI when the time comes. And always, always pay on time!
Good catch, K. I at first read that as OP wanted to leave a few dollars at statement cut date then pay by due date (which you should).