Good question!
It is important to start off by pointing out that the main “driver” for a change in demand of a good will be a change in price of that good, which will in turn affect the demand.
There are more or less two types of goods, complementary goods and substitute goods.
Complementary good are goods that go well together. For example milk and cereal. So if the demand for cereal is high the demand for milk will also be high.
Conversely, substitute goods are goods that don’t go well together, or can act as an alternative. For example tea and coffee. If the demand for tea is high, the demand for coffee could be low.