How can i better analyze areas

[Juan Mendoza]

Hello, everyone! I'm trying to learn everything I can about the exciting world of real estate. I've been watching videos to educate myself better, and someone in a video briefly mentioned that neighboorhood's get a rating. Basically, he explained there are A+, A, A-, B+,B, etcetera. My question is I live in the suburb of Romeoville IL in will county I want to know my market. Is there a website that I can go and search? Does such rating even exist? If so what is the name of this index? and where can I find it? sorry if it's a dumb question. Thank you for reading my post.