Electric wiring question
I haven't switched a switch before and was looking into getting caseta smart switches but before that I wanted to see if my wiring would be an issue or not.
I have 3 black wires going into the switch, 3 neutral wires in a wire but, 3 ground wires attached to the back of the switch plate but not attached to the switch itself.
Can anyone one tell me what's going on here? One of them I assume is a Traveller wire? Is there an easy way to find this out or I need a voltage tester?

I have 3 black wires going into the switch, 3 neutral wires in a wire but, 3 ground wires attached to the back of the switch plate but not attached to the switch itself.
Can anyone one tell me what's going on here? One of them I assume is a Traveller wire? Is there an easy way to find this out or I need a voltage tester?
