Special Relativity? That's another thing you gotta explain to me

All of us, everything in the universe, everything, moves through spacetime at the speed of light. Spacetime is made up of four dimensions, the three spacial ones we notice every day, and time. Now, if you are at rest, with zero movement in the space dimensions, then you travel through time at the speed of light. As you begin to travel in the three spacial dimensions, you have less velocity to move through time, as all the vectors must add to the speed of light. So, the faster you go through space, the slower you go though time.

That's the main tenant of SR. Everything else is based on the fact that the fastest one can travel is the speed of light. Now, there are relativistic issues, based on frames of reference and what one will observe in them, but that will be for a later discussion.