How to say useful tip in Korean
Korean: 꿀팁[ kkul-tip ]

Meaning
'꿀팁' means a very useful tip or a smart little trick that helps you do something better or more easily. People use it in casual speech when sharing helpful advice for daily life, school, shopping, travel, and more. In English, it is close to saying 'a great tip' or 'a life hack' (꿀팁).
Example sentences
친구가 시간 관리 꿀팁을 알려 줬어요.
My friend told me a useful tip for managing time.
매니저가 업무 효율 향상 꿀팁을 주었어.
The manager gave me a useful tip to improve work efficiency.
친구가 요리 꿀팁을 알려 줬어요.
My friend told me a useful cooking tip.
점원이 할인받는 꿀팁을 알려 줬어요.
The store clerk told me a good tip for getting a discount.