What kind of? noun + gì

Put gì straight after a noun and it asks what kind, or what name: Anh thích ăn món gì? What kind of food do you like? Em học tiếng gì? What language are you learning? Trái này là trái gì? What fruit is this? (In Hà Nội a fruit is quả: Quả này là quả gì?)

The answer swaps in the kind or the name: Em học tiếng Việt.

It's also how you ask what something is called, or what someone does: Quán này tên gì? What's this place called? Chị làm nghề gì? What do you do for a living?

Without a question, after không, gì means "anything": Em không ăn gì. I didn't eat anything. Không có gì. It's nothing, or You're welcome.

Gì and nào both come after the noun, and English uses "what" or "which" for either. Gì asks what sort, out of anything at all: Em thích màu gì? What color do you like? Nào asks you to pick from a set, often one you can see: Em lấy màu nào? Which color will you take?