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Black holes have gradually become common objects in the universe. However, there are still many questions that pique our curiosity: What about the energy of a black hole? Where does information falling into a black hole disappear to? Is matter locked in a black hole forever? How do characteristic jets form? Will a black hole swallow all objects in its vicinity? How does the Penrose mechanism work? What is the Blanford-Znajek mechanism? Do black holes have magnetic fields? And where are black holes found? If these questions interest you, this lecture is for you.