Thank you. But I don’t think you are addressing the basic question of how I can use the program in a reasoned manner. Firstly, I describe my further efforts and outcomes. I have been careful to record exactly what I did and what happened.
1. I opened my background image and resized it.
2. I copied my Layer 2 image and pasted it into a new layer.
3. I resized and moved the Layer image (dragging corners).
4. I brought the Background layer to the top and had it as the only one activated. According to the manual, this should select it. But I couldn’t do anything with it, whereas the deactivated (and therefore supposedly not amenable to editing) layer could be edited in all sorts of ways.
5. I did what you suggested in this situation, deselecting with Ctrl + d. I was then able to resize it by dragging its corners and to edit eg its brightness.
So far, so good.
6. I next brought Layer 2 the top and made it the only layer activated and applied Ctrl + d, just as I had done to get the Background layer activated. But I couldn’t do anything with layer 2. Only the deactivated Background layer could be changed.
7. I made the Background layer active, then deselected it with Ctrl + d. Then I made the background layer inactive. Layer 2 was still active. I could now move Layer 2 and edit it in all sorts of ways - brightness, sharpen, black and white, crop, change colour, etc. But I couldn’t resize it by dragging on the corners.
8. I then thought that I could change its size with the zoom tool, and I could but it does it in large steps so it’s not so helpful as dragging the corners. Further, I then found I couldn’t zoom out - is there supposed to be a zoom out function? Nor would Undo restore it to its former size - or reverse anything else. Nor would it let me do anything else. I was stuck. I used Ctrl + d, but was still stuck. End of session.
You say this is how editing programs work, but I don’t know what you mean by this. Presumably the manual is supposed to tell you how it works, but I can’t predict what’s going to happen from what it says. And now I’ve used exactly the same steps to get each layer editable and it worked for one but not entirely for the other. How could the greater experience you champion help with this - the experience will help only if it’s successful, and success needs helpful guidance.