What is Relativity? by Landau & Rumer

Good and simple to read into understanding the theories of relativity. In a nutshell the theory of relativity says that many things that we think of as being fixed are actuality relative. For example "UP" is relative to the viewer. For instance up for somebody in the U.S. is in the opposite direction of up to someone in China, for the earth is a sphere and not flat. What relativity explains is that even time and space are relative and can be different to 2 different viewers, for someone that is in the event and the other who is the observer. I can apply this to us physical embodied beings being in time and space, while God the active, observer watches us over us from outside of that realm.