Master Electrician Teaches how GFCI (Ground Fault Circuit Interupter) Receptacles work, Thoughts?

What happens here

This video features a Master Electrician Dad explaining the fundamental principles and operation of GFCI (Ground Fault Circuit Interrupter) receptacles to his apprentice son. He delves into the internal components, specifically the toroidal coil, and how it detects current imbalances to prevent electric shocks, highlighting the importance of this safety device and its evolution.