Can you answer my General Theory of Relativity question?

Describe three key concepts of General Theory of Relativity and when what it written and by whom?|||Einstein's general theory of relativity deals with gravity and its effect on space. He states that a massive body cause the curvature of space and light or bodies moving in space will follow this curvature. Proof was provided in an experiment during an eclipse of the sun, the position of a star which was known to be behind the sun at the time of the full eclipse could be seen from Earth, as the light from the star bent around the sun.|||http://en.wikipedia.org/wiki/General_Rel…|||You might want to edit that.