We are investigating MPS for an upcoming project. The biggest barrier to entry is the complete lack of good documentation and tutorials. I bought the few books

We are investigating MPS for an upcoming project. The biggest barrier to entry is the complete lack of good documentation and tutorials. I bought the few books I could find and there was very little meat. The biggest thing that is missing is the WHY of everything. The help/tutorial says "click here to do X" but there is no explanation of what X is and how all these concepts play together. So is there any advice on learning how to use MPS from a conceptual level?