How to classify a neighborhood?

[Therese V.]

I am having trouble with the distinctions between Class A, B, C and D properties. I grew up in an area that I feel safe and comfortable in and my mom still lives there. But, I've been there with recent friends and some are afraid to be in the car without ducking. I think this has messed with my ability to understand the difference between this class distinction.

What does warzone actually mean? Ghetto? Looking at things with an investor's mind is different than what I have normally been thinking and I want to make sure I understand where it is NOT a good idea to invest.