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¿Qué haces ahora? – “What are you doing right now?”
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¿Qué es esto? – “What’s that?”
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¿Cuál es tu país favorito? – “Which is your favourite country?”
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¿Cuál es tu película favorita? – “What is your favourite movie?”
Here there are some notes: In Spanish, “what” has two different words: qué and cuál. This can get a little confusing, but an easy way to remember it is that qué has only one factual answer possible. You use cuál to ask about a personal opinion or a choice between options. Cuál is a bit closer to “which” in some cases.
If asking about something that's plural, cuál becomes cuáles. Like in the last example, if you instead asked “What are your favourite movies?” it would be ¿Cuáles son tus películas favoritas?