This is the 766th most frequent Korean word.
곧
Soon.
Here, '곧' is used to indicate that the action is happening shortly.
그는 곧 도착할 거예요.
He will arrive soon.
In this sentence, '곧' is part of '곧장', which means 'straight ahead'.
곧장 가면 그 건물이 보일 거예요.
If you go straight, you'll see that building.
The word '곧' again means 'soon' here, expressing that the end is nearing.