I appreciate the posts, MedianUV and HechtHeftig. It's given me a lot of insight.
One more thing: Do I need to download D2Stats?
I was playing just fine without it so far on the ladder.
But would it help me on single player? I'm just worried I won't understand it.
I am not good at messing with files or installing things to be honest. Initially downloading Median XL confused me. I couldn't figure it out. And then I went to the Discord channel and somebody gave me a simple link. One click and all of a sudden it was super easy and it installed automatically with its own icon (app) on desktop.
If D2Stats is easy to download and use I'll definitely check it out. Otherwise I'm not interested.