I just realized that if you use an existing field that is used in another content type and you change the field settings, you end up changing it on the other content types that share the same field. Is there a way to tell where else an existing field is being used?
Example: I have a field called "field_image" and using it in my basic page content type. Now I use it for my blog content type. How can I tell my basic page content type was using that same field?