You are all very perceptive, and as @priort put it:
I’m muddling my way through, but while doing so, I’m getting reasonable results as I edit several images a day. It gets easier to get to do what I want. I feel like a blind person stumbling my way through a home, eventually learning.
This answers my questions from last night - and I remember being asked something about Monochrom that I didn’t understand, whether I wanted to apply it to “similar” photos or something like that. Obviously this is what caused my problem. I don’t remember reading that the module I’m now using, whatever it is will do those other things automatically. Before stopping last night, I decided not to delete them, and to just leave them as-is; the only one that was annoying for general use is the one that I somehow added, Monochrom.
In order, once I’m fully awake, I will watch:
“Rapidfire Fix #3”
marketable ep 069 - a Newbie’s introduction to marketable
…and read:
darktable 3.8 user manual - history stack
darktable 3.8 user manual - overview
As to the first paragraph, that sounds great, but I’ll save this for later, once I have a better feel for what’s going on.
As to the last part, if “everyone” (me included) is asking similar questions, maybe those questions and answers should be lumped together into a single file newbies can download. Maybe it is - a huge number of my searches led to a dead end, probably because they included “3.6” in the name, and now DarkTable is up to “3.8”. I did watch lots of videos, but they all assumed I knew more than I did.
It’s a new day, and for the first time I think I have a rough understanding of what’s going on. I still have questions, such as what did I do to reverse the order of my images down at the bottom of the screen, and how to “zoom into that screen” instead of having to click on “2021” to get to my few images that I’ve worked on. Thank you all!!