Installing outlet in electrical box with two sets of wires? - Home

(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

Adding an Electrical Outlet in the Middle of a Run

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How to Wire Electrical Outlets and Switches

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Electrical Outlet Basics

electrical - How to connect my new light fixture that has 2 (+ground) wires to the ceiling box that has many? - Home Improvement Stack Exchange

Light switch - Wikipedia

Outlet Box Kit, 2x4'' Utility Electrical Box, Tamper Resistant 20 Amp Duplex Receptacle Outlet, Duplex Receptacle 2x4'' Cover, Green Pigtail Grounding Wire and Screw, Ten 1/2'' Knockouts

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The Different Colored Electrical Wires Explained, How to Wire an Outlet

314.27(C) Boxes at Ceiling-Suspended (Paddle) Fan Outlets.

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