0 ms attack will have a very 'ringy' sound. 10 ms will have less so much ring.

Use the 'Bypass' option to hear the native sound and see what the compression is affecting, especially listening for what tones are brought up instead of being pulled down.

I found I needed to use studio monitor headphones with the volume turned up fairly loud to start noticing the subtle differences. It does take time and you really need to listen to all the parts of the transient. Once you know what to focus in on, it gets a lot easier. TBH, 3 months ago, I was having the same frustration you were having; I thought I’d be that person who just doesn’t get it. Good luck — you got this!

I like Scott's answers. You have to just try to listen more, even if it seems silly at first. I feel like the 0ms attack squashes the sound more (the overly compressed effect), and when you go up to 10, you can start hearing dose tiny peaks of the sound, and as you go up to 20,50, 100, the compressor releases more of the sound to hear. with the other compressor challenge i would just listen to the dynamics of A and B and the one that has less of dynamics is the one you pick.
Hope this helps!

10 gives more transient( so a smal plop) 0 does not. also try to play with volume alot, putting it down to my hearing limit helps me sometimes.