680 Credit Score at 18 Good? How do I grow it fast?

Hey, Im 18 and i have a 680 credit score I was wondering if thats good since Im only 18 and will continue to grow it.

I also dont know how to grow it fast. Currently Im a participant in family sharing for Apple Credit card where I spend monthly my dad pays it and I will be reported to credit bureaus. I also just applied for Discover IT student card as-well to grow my score. My only income is doordash and savings. Tips things I need to know going foward?