It's an interesting question - I think all Na'vi know the basics at least, but some do likely do other things, at least as their main thing - for example, Ninat is mentioned as being a singer, and the Na'vi make lots of different things, many of which would require quite a lot of skill, in addition to other activities such as fishing, collecting plants and weaving. I would guess they likely know the basics (how to use a bow and ride a Pa'li, at least) but that doesn't mean they all go hunting.
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