Lots of references to checking for voltage or 'get a meter'. To most people this is effectively meaningless.
What you need is either a non-contact voltage detector,
Here:
https://www.amazon.com/Klein-Tools-N...voltage+tester
OR
A circuit tester here:
https://www.amazon.com/Sperry-Instru...=outlet+tester
Better yet, both
Here:
https://www.amazon.com/KLEIN-TOOLS-N...=outlet+tester
I have only linked good brands above, there are cheaper brands available. These tools are small and well worth having.
Edit to add: For those who don't bother clicking on the links, these are less than 8.00 to as much as a whopping 23.00. They will pay for themselves many times over for this sort of occasion