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What are those?
You're looking at the back of 3 outlet fixtures. He's sticking them into a 6 plug box, and has wired them sequentially. Could also be up to three fixture switches, or any combination of the two.
Guessing here, but generally speaking the copper is the live wire, the black is the negative, and the white is the ground.Apparently bare copper is the ground, per a comment below, so no clue.
Promise me you won't do your own electrical work without doing a ton of homework first - bare hot wire is a good way to burn your house down
Haven't had to need to do any in several years. Even then it was literally just swapping some ugly light fixtures, so I just took a picture of the original fixture, and rewired the new one the same way using the existing wire.