This safety lesson focuses on the importance of Ground Fault Circuit Interrupters (GFCIs) in preventing electrical hazards. It covers how GFCIs work, where they should be installed, and the dangers of ground faults. The video explains the importance of testing GFCIs regularly, identifying faulty circuits, and understanding OSHA regulations for GFCI usage. By following these safety practices, workers and homeowners can reduce the risk of electrical shock, fires, and accidents, ensuring a safer environment for everyone.