Connecting Arduino Uno with Raspberry Pi

Is it possible to connect Raspberry Pi with Arduino Uno through Zigbee and Bluetooth?
I need to know whether both are possible or not?

I heard like that only Arduino Nano alone can be connected through Zigbee, is that so? or else is there any other way to connect?

Yes

just about anything you can do on an UNO, you can do on a Nano, and then some...

Can you suggest me any web documents or videos as a tutorial kind of?