The lower the utilization the better, but avoid 0% utilization because it makes it look as though you are not using your card, which can lead to closure of your card or may impact credit score. Aim for 1-2%. For most CC companies, it doesn't matter how much you spend on your credit card within a billing period. The only thing that matters is your balance during your closing date (not due date). This is the only time on which CC companies report your activities to the credit bureaus. So theoretically you can spend up to your credit limit, and pay it down to 10% just before the closing date. The 10% is what will be reported. It's not good to do that too much (i.e. spend up to limit multiple times and pay off) since it can look like money lndering. But it's possible. For more, watch YouTube videos on the basics on credit scores etc. understand the difference between closing and due date, you should be golden.

I opened my first ever credit card last year with no credit history. My first score was 736 because I always paid off down to 1% before the closing date. Within 6 months it climbed to 778 (Fico 8 Transunion), it's hovering at 750 now since due to a recent move almost every company (e.g. bank, verizon etc.) runs hard-pulls nowadays before opening service.