Colour, saturation and stacking

[Journeyman]

Good day, I would like to ask for help understanding and using editing software to clear up moon shots please? Any help including off site tutorials will be welcome.

Quite a bit of information assumes computer knowledge I don’t have. Not that long ago I used MS Access to build maintenance systems. I used all of the available tools to build the systems. That was then, I am still ok using access, no processing help there though.

Is stacking used to provide a clear image rather than a coloured one?
When stacking, are the images overlaid and integrated as each one is added?
(As a basic level) Is the clear image then ready to export?
Are the stacking capabilities of an editing program suitable to use?

Are the colours then brought to the surface using an editing app, e.g. Lightroom, Corel, Luminar?

I am a little behind the eight ball as my computer is unable to run Lightroom, not a problem in itself, most of the tutorial information available uses LR as the editor.

I have downloaded AutoStakkert 3, selected several photos, stacked them, no obvious change. Not sure I actually dropped any photos.

Thank you in advance, this has been causing me many dark thoughts.
Journeyman (Dennis)