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In the lecture, I learned a crucial concept, fire relies on four key elements heat, fuel, oxygen, and chemical reactions. Understanding the role of chemical reactions in combustion is essential for firefighters, as it enables them to develop effective strategies for extinguishing fires. The second takeaway from the lecture would be the classification of fires. A being ordinary combustibles (wood, paper, clothing etc.) B. being flammable liquids (grease, oil, paints, solvents etc.) C. being live electrical equipment (electrical panel, motor, wiring etc.) D. being combustible metal (magnesium, aluminum etc.) and K being commercial cooking equipment.