Setting Up Suppliers

New to FrontAccounting. I am a student and we are working with this program in my Accounting Information Systems class. For the "suppliers" information when adding a new supplier, can some one give me a brief rundown of the purchase account category and the purchase discount account category? Say for instance, if I am setting up a painter who is going to paint my building or purchasing office supplies, what accounts would I use for these two options? Thanks in advance for your help!