If the nano is basically a screen, how do I control the device?
It’s true that Apple has ditched buttons on the iPod nano (with the exception of physical volume buttons). Instead, the nano now offers touchscreen controls. You navigate the device’s menus and control it by scrolling and tapping, just as you would an iPod touch or an iPhone. You can also control playback using the inline remote control on Apple’s (now-optional) earbuds with remote/mic or any compatible third-party headphones.