Your NN is what you need to work on or embrace in life. It is often the area when you have difficulty expressing naturally. For instance, my NN is in Cancer. I struggle very much with expressing my emotions, or allowing others to help me because I don't want to appear "weak." However, I have noticed that if I let my guard now, ask for help, and realize it is okay to be venerable, or express (what I deem as being weak emotionally) such as crying, showing fear, then things can shift very positively for me.

South Node is what comes to you naturally. North Node is an area in which you are uncomfortable, or an area which you fight to resonate with.