When do you answer a question using the spanish word hacer?

You answer a question using the Spanish word hacer when the question asks about a person's activities, actions, or habits. Typically, it is used in questions that start with "qué", "cómo" or "dónde" and then followed by the verb "hacer".

For example:

- ¿Qué haces en tu tiempo libre? (What do you do in your free time?)

- ¿Cómo haces ejercicio? (How do you exercise?)

- ¿Dónde haces compras? (Where do you shop?)