If You are working with buyers it is more than likely they will need a loan to purchase their home. You will have several lenders you will be working with it is important that you understand the different types of loans available. 

This is one of the greatest skillsets  to develop in real estate. What do you need to learn to do this? First you need to understand your purchase contract. For there are many different levers you can push and pull to get what your clients wants.