If you have already taken a college course in high school…and you retake the same course in college…that’s a retake.
If you want to better understand…look at Kahn Academy or some other resource where you can self study.
My kid tool duel credit anatomy and physiology in high school She was required by her college to take it again at their school as a required course in her major. Luckily, she got A grades both times. She wasn’t planning on medical school when she was in high school so had no idea this would be an issue.
No way to know how the Med schools she applied to viewed this. But at an interview, she would have easily been able to explain. It was required by her undergrad school. Believe me, she didn’t want to retake the same course…the college insisted.