What is General Relativity?

References:  General Relativity - Wikipedia https://en.wikipedia.org/wiki/General_relativity Field Equations - Warwick Department of Physics https://warwick.ac.uk/fac/sci/physics/intranet/pendulum/generalrelativity/ Heisenberg’s Uncertainty Principle - Wikipedia https://en.wikipedia.org/wiki/Uncertainty_principle Stress-Energy Tensor - Wikipedia https://en.wikipedia.org/wiki/Stress%E2%80%93energy_tensor Einstein’s Field Equations - Wikipedia https://en.wikipedia.org/wiki/Einstein_field_equations Einstein Tensor - Wikipedia https://en.wikipedia.org/wiki/Einstein_tensor Pseudo-Riemannian Manifold - Wikipedia https://en.wikipedia.org/wiki/Pseudo-Riemannian_manifold Metric Tensor - Wikipedia https://en.wikipedia.org/wiki/Metric_tensor Ricci Curvature - Wikipedia https://en.wikipedia.org/wiki/Ricci_curvature Metric Tensor in General Relativity - Wikipedia https://en.wikipedia.org/wiki/Metric_tensor_(general_relativity) Schwarzschild Metric - Wikipedia https://en.wikipedia.org/wiki/Schwarzschild_metric Einstein’s Theory of General Relativity - SPACE.com https://www.space.com/17661-theory-general-relativity.html Gravitational Lensing - Wikipedia https://en.wikipedia.org/wiki/Gravitational_lens Laser Interferometer Gravitational Wave Observatory - Wikipedia https://en.wikipedia.org/wiki/LIGO Equivalence Principle - Wikipedia https://en.wikipedia.org/wiki/Equivalence_principle Gravitational Time Dilation - Wikipedia https://en.wikipedia.org/wiki/Gravitational_time_dilation