1. 직진해 => Go straight (with no turns). (mostly used for driving directions) 2. 곧장 가 => Go directly to the destination without turns or stopping by other places (used generally). 3. 쭉 가 => Keep going straight (without stopping or turning). * 직진: straight(직) move/advance (진). * 곧장: straight (똑바로), right to the destination (바로, 다른 데 들르지 말고). * 쭉: in a straight line(돌거나 머뭇거리지 말고); continuously(계속해서). So, 직진해 is different because it is about driving directions. Between 곧장 and 쭉, 곧장 emphasizes straight direction or going directly to the destination. 쭉 seems more about uninterrupted, continuous movement.

thank you!

1. 직진해 -literally "go straight" usually, Use this expression when you talking to taxidriver ex) 직진해주세요 2. 곧장 가 -This expression is sometimes used in native but meaning is same! "go straight" 3. 쭉 가 just same mean. usually, Use this expression when talking to friends and meet in street :) people is used the most this expression