What are the meanings of Tropic of cancer, Tropic of cancer and Arctic Circle?

Tropic of cancer (Tropic of cancer) refers to the North-South boundary that the sun can reach when it does the Tropic of cancer. Due to the existence of the earth's rotation and the angle between the yellow and the red, the sun's direct point makes the Tropic of cancer at the equator. Tropic of cancer is the North-South boundary that the sun's direct point can reach, that is, the place between the Tropic of cancer can get direct sunlight, while other places can't
In other words, there is polar day and polar night in the north and south polar circle, but not in other places

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