Illuminating different parts of the dungeon.

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1. Could you please tell me how to create different lighting in different parts of the Dungeon? For example, if the Inferno Castle is located in the center, the lighting for it should be red, and in the left part, let's say, there is a Necropolis, so the lighting for it should be darker.

You can create some neutral, subtle lighting for the entire map, and then give luminosity to certain objects in separate "locations" to create the atmosphere. Otherwise, it's not possible.

2. I also want to know if it's possible to highlight small areas. For example, in the same Dungeon, an area of 5x5 is filled with crystals (not resources), and I would like to highlight them, creating, say, an independent light source.

Yes, you can make the crystals glow. Click on one of them, go to the left panel (ObjectPropretiesTree), and there should be a Light property. You need to choose the color, radius, and coordinate relative to the center of the object.