How to interpret the audio summary

Hi all, very psyched for finding out this API, but would like some explanations.

Can someone explain or point me to a link where the explanations for each feature is?

I'm interested in danceability, energy, loudness, speechiness, liveness, tempo, and time signature.

For these, could you give me an explanation as to what the min and max is? for instance, loudness of -4, is that louder than a -5?

Thanks!