Thanks again. I am not going to complicate it any more than I am LOL. One distro with one flavour that comes with it, maybe sprinkled with some fairy dust. Now when I finally practiced with Rescuezilla I will certainly make an image backup once up and running. The data will come later. I had difficulties verifying the gpg signature (the other code was correct, managed comparing that to make sure the iso wasn't corrupted). That was via torrent client I have never used before and installed just today. The certificate on Linux website somehow didn't succeed comparing, also installed some Kleopatra that was supposed to do it for me. In commands in Windows it also didn't find match, something didn't go right, I cannot tell what now, my brain is now like a pancake, after midnight.
So downloading another copy of iso from the mirrors, one of the universities I chose, that will take 4 more hours, that comes with the needed certificate and hopefully I will make sure it is without issues. There apparently are at least two methods how to do it.
I am so new to these operations that it is so confusing. For the past hour and something I was swapping the old Win11 ssd with the new blank ssd and wondered why it wasn't recognised for booting to install Linux to it in the morning. Because I didn't install Linux on it yet! Or anything of that kind to make it bootable. But at least I managed to format it to ext4 externally, via another software I found today and installed, MiniTool Partition Wizard, used for the first time! Because Windows doesn't offer this format. Hope that at least that was correct! Goodnight!