Some of my tomato’s leaves are turning black like this. Should I be worried?

Google says, “Tomato leaves turn black when the plant is stressed by temperatures, disease, or herbicide injury.”

Your tomatoes get chilled or frost over?

I'm only a new gardener but I've never seen that before!

I’d take some clean shears and prune the black leaves, assuming it’s not entire plants. If it’s some kind of disease/blight this can help keep it from spreading.

Is this why it's a "nightshade"?