(apologies for possibly very newbie question) I found this setup in an electrical box in my downstairs closet underneath my stairs. It has two sets of wires that seems to be connected serially. My
Learn the Basics of Home Electrical Wiring - [Wiring Installation Guide]
How to Install Remodeling Boxes - The Home Depot
Wiring a Switch and Outlet the Safe and Easy Way
Box Fill Calculations for Home Inspectors and Electricians
How To Connect Wires Without Soldering
Ceiling Box Too Low R/electrical, 57% OFF
Different Types of Electrical Outlets
Wiring a Switch and Outlet the Safe and Easy Way
314.27(C) Boxes at Ceiling-Suspended (Paddle) Fan Outlets.
How to Wire a Double Duplex Outlet - DIY Wiring Projects (OFFICIAL VIDEO)
How To Wire An Electrical Outlet - Addicted 2 Decorating®