The question is asking you how you are doing, my answer is just an example you can use it or not, but you can simply reply I am good (estoy bien) or you can ask how they are as well after you have asnwered the question
mi dia de celebracion es el 20 de julio. en colombia se celebra ese dia porque es el dia de laindependencia. todas las personas se ponen la camiseta de la seleccion y hacen muchas fiestas.