This is the 12847th most frequent Russian word.
курсом
"Курсом" means "by the course" or "at the rate" in English, depending on context.
Here, 'курсом' refers to a directional path or trajectory being followed.
Мы ехали вдоль реки, следуя заданным курсом.
We traveled along the river, following the prescribed course.
In this case, 'курс' represents a structured program of study or training.
Я записался на курс по рисованию в местной школе.
I enrolled in a drawing course at the local school.
Here, 'курс' indicates the exchange rate of currency.