Thanks for answering me

값 = price, value. This is very broadly used word ranging from price of an item (물건값) to a more abstract meaning like value (값나가다 = is valuable). 가격 = a (fixed) price of an item. This is the most common word for "price" in commerce. (물건 가겨 = price of an item, 할인 가격 (or 할인된 가격 = discounted price). 비용 = cost, expense. This usually means the expenses required to do something, like traveling to a place, setting up a business, etc. (여행 비용 = travel expenses, 사업 비용 = cost of business). 값 and 가격 have fair amount of overlap in usage, whereas 비용 doesn't.