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The category of black holes and state-of-art detection scenarios

The existence of black holes has been proposed for more than two centuries. Contemporarily, plenty of milestones have been achieved in this field, e.g., the first image of the black holes and the launch of the James Webb Space Telescope. This paper focuses on the organization of recent achievements in this field including three main parts: the history and fundamental concepts of the black holes; the classification of different black holes through their physical qualities; and progresses in this decade. These results shed light on the technical developments of the ability to detect black holes, which is beneficial to further research in the future.