software recommendation – How to find out, what I am able to look for in Spotlight

I am looking for a very good documentation or tool, that help’s me to make better searches in spotlight.I have found some descriptions like: “”, there I can find e.g. kMDItemKind, but what is possible to define as Kind ?

I know in I can define a search like “kind:folder”, but what’s possible behind kind instead of folder, how can I find out what I am able to search for ? “kind:” stands here as a example, but there are much more keywords, but I want to know what are the possible values for this keywords.

Either a documentation/manual/reference about the keywords or a tool, that evaluates the possible values out of my spotlight database.