Hi Leon,
If you are looking at a simple process to stack photos to reduce noise without going the extra mile of darks, flats etc., then I would recommend Sequator https://sites.google.com/view/sequator/
I second Sequator, it's amazing for widefield shots with a variety of adjustments which are simple plus masking of non rotational objects like trees and shrubs so they don't distort.
The software itself is pure simplicity and my go to for a lot of non planetary related stuff.
It's fast, easy to use and does a good job of stacking images. If you're so inclined you can also include dark frames into the mix - Sequator calls them "Noise images" (or something like that - it's been a while since I used it.)