Can anyone expand on what that 2-dimensional math would look like, compared to GR in typical tensor form? If I'm almost capable of working in tensor calculus,

Can anyone expand on what that 2-dimensional math would look like, compared to GR in typical tensor form? If I'm almost capable of working in tensor calculus, would I be in a position to understand the 2 dimensional formulation? Or are these question too naive and I need to study something else first?