I'm running electricity to my shed by extending an outdoor GFCI receptacle. I just finished my rough-in inspection and got approval to cover. The inspector had a few comments, but spoke fast, and since I'm a beginner, I didn't fully understand what he was saying until after he left. He mentioned that I had two circuits, but that it was fine because "multi branch circuits are allowed, I would just need to share a common neutral and use a two pole breaker and a two pole switch". All of that is over my head, and more complex than I intended. I didn't realize until after he left, that I had accidentally run my wires differently than I had originally planned which resulted in two circuits instead of one.
Here are a few photos to visualize the situation. I have a conduit feeding the shed with 12/2 THHN and two NM-B wires coming out from inside the shed.
Inside the shed, one NM-B wire goes to two receptacles, and the other wire goes up through the top plate to some ceiling lights and a switch.
I only intended for one circuit and I think I only need one circuit. Instead of running both NM-B wires out to the box, can I simply join those two wires, and run an extra wire to the first receptacle to make it a single circuit? Or am I missing something? Like this: