PLEASE EDUCATE ME:How to read a site like Zillow

[Stephen Moskowitz]

Great website, thanks to BiggerPockets and all of you out there!!!

I'm just trying to educate myself and get a feel for REI. I was wondering about going on to sites like Zillow. What am I looking for? Many times there properties listed well below what they "Zestimate" the real value. Are there any pointers in regards for what and how I should be looking? I know it does not replace a good working knowledge of the area but I imagine knowing how to navigate such sites could be a useful tool.

Any advice??