How many languages do you want to learn? This is correct now.

Ok, I am a little confused with "do", I need most prectice.... Thank you!

"How many languages do you want to learn?" Beware of word-for-word translation... it often doesn't work, or it makes you look poor at the language.

How many language you want learn? lo que intento preguntar ¿Cuantos Idiomas quieres (o quieren) aprender?

Hola Mario. Perhaps you mean to ask 'How many languages do you think that you've learnt?'. To be honest your question is a little ambiguous and you could even interpret it as 'How many languages is it possible to learn?'. Take it easy, Ed.