In summary, "Electrodynamics of moving bodies - §2: On the relativity of... (again)" explores the principles of relativity concerning the behavior of moving bodies in the context of electromagnetism. It emphasizes that the laws of physics, particularly electrodynamics, remain consistent across different inertial frames of reference. The section discusses how electric and magnetic fields transform between these frames, highlighting the significance of relative motion in understanding electromagnetic phenomena. Ultimately, it reinforces the idea that no single frame of reference is privileged, underscoring the fundamental nature of relativity in modern physics.