How to make questions in spanish

In spanish it does not exist the "do" in front of the verb when you make a question, neither when you answer, as you may find in the following examples.

-¿Quieres ir a la playa con nosotros?:-Do you want to go to the beach with us?

-sí:-Yes I do.

-¿Hablaron de eso?:-Did you talk about that?.

-No, no hablamos:No, we did not(didn't)