¿Cuál o Qué?

¿Cuál o Qué?
 

En mi clase de español, aprendemos sobre pronombres interrogativos, como 'qué' o 'cuantós'. Mi maestra de español dijo que usas 'Qué' cuando la reacción es de un grupo prevista (e.g. ¿Qué día es hoy? Sabes que la reacción es una día). Ella dijo que usas 'cuál' cuando no sabes de qué grupo es la reacción. Este comprendo, pero mi otro maestra (de la año pasado) dijo que les usas en la otro camino. Ahora confundo :(. ¿En cuál camino uso?

Sé hay muchos faltas en mi post. Corrígelos, por favor :D.

Corrections above, but I couldn't understand what you were trying to say in a couple of spots.

I haven't ever heard or learned the 'guidelines' you've been taught.
There are good answers to your question here, here, or here.

Yeah, it was a streach for me to try to convey what I meant in my rudimentary Spanish. Basically, my teacher said that you use Qué when you know that the response is going to be a certain type of answer. Like when asking 'What day is it?', you know the response is going to be one of the 7 days of the weeks. Cuál, she said, is used for the opposite, as in asking for a phone number, the answer can be any number. Does it really matyer? I completely forgot to search for previous threads on this , so I will take a look at those. Thanks for the corrections! Most of those things I have already been taught, i just forfet to use.

There are a lot of threads that differentiate the two, but I found some websites that give the same answers. Have a look at them and see if they answer your questions.

Those websites cleared everything up! Thanks once again!

¡No hay de qué!