Not an audio engineer but i used to work with them. 😅 With that caveat in mind I will try to explain what i know.
attack/release refer to how quickly the compressor responds to loud music.
Ratio refers to how much dynamic/volume compression is being applied. higher numbers mean more compression.
Frequency: i'm not sure what that does in this context.
Threshold refers to how loud does it need to be before compression is applied. If it is turned way down then it will start compressing when the music not very loud. as you turn it up it won't start compressing until the music is louder.
how much extra volume is added to bring the volume up again after applying compression.