The descriptions here of what “Special Relativity” and “General Relativity” really muddy what Einstein was investigating.
Special Relativity explores and describes the motion of an electron in a circuit. The equations that govern the world from the electron’s point of view and the wire’s point of view prior to Einstein were quite different and nobody could figure out why. Special Relativity is the relationship between the two.
General Relativity is similar, but relates the general motion of any body to its surroundings. This includes things light bending around a star and the motion of Mercury.