I will be getting a new iPod nano 3 soon. What should I know?

Apple stopped making new iPod Nano devices several years ago.

https://en.wikipedia.org/wiki/IPod_Nano

Did you possibly mean iPod touch? Those are available new. iPod touch is effectively an iPhone, without cellular communications.

Hello,

You should know that Apple no longer supports these devices. This iPod model does not support the Apple Music streaming service.