der Course
golf course
A term for the playing area in golf, the golf course.
Der Course war nach dem Regen sehr nass, aber gut bespielbar.
The golf course was very wet after the rain, but still playable.

course
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golf course
A term for the playing area in golf, the golf course.
Der Course war nach dem Regen sehr nass, aber gut bespielbar.
The golf course was very wet after the rain, but still playable.

The German word 'der Course' refers only to a golf course or a racecourse. It is a false friend of the English word 'course', which can also mean a university class or a course in a meal.
Der Golf-Course hat insgesamt 18 Löcher.
The golf course has 18 holes in total.
'Course' is a technical term from golf and horse racing. The word is hardly used in general everyday language.
Nur Experten für Pferderennen kennen den Zustand des Courses genau.
Only horse-racing experts know the exact condition of the racecourse.
When talking about playing on a golf course, the preposition 'auf' (on) is almost always used: 'auf dem Course spielen' (to play on the course).
Er hat zum ersten Mal auf einem so schwierigen Course gespielt.
He played on such a difficult golf course for the first time.
race track
'Rennstrecke' and 'Course' can both mean a fixed track or route for a race. 'Rennstrecke' is the normal German word and fits especially well for car, motorcycle, or horse races. 'Course' is more specific and sounds more technical or foreign-language influenced; in racing, especially in equestrian sports, it can mean the fixed route. The words can be confused because both describe a track for a competition. In normal conversation, 'Rennstrecke' is almost always more natural. 'Course' should only be used when this technical term is actually common in the particular sport.

Beim Pferderennen führt der Course zuerst über eine lange Gerade.
In the horse race, the course first leads over a long straight.
Nach dem Regen war die Rennstrecke für die Fahrer sehr rutschig.
After the rain, the race track was very slippery for the drivers.