what are the fundamental fields in nature
Currently, physicists describe nature as having 4 fundamental forces: the Electromagnetic force, the Strong nuclear force, the Weak nuclear force, and the Gravitational force. At one point in history, the Electric and Magnetic fields were treated as separate. If you count these two fields as separate and add them to the other 3 traditional force fields -- the Gravitational, Strong, and Weak fields -- then, nature might be described as having a total of 5 fundamental fields in Physics.