Thank you all so much!
As for the distro, I have installed MX Linux 23.3 64bit yesterday and I'm loving it. Much more that the LMDE6 before, and not just because it is faster and feels lighter. This time, I used gparted to split the hdd in two (I'm used to have all my stuff far away from the os partition), and this probably helped it to be quicker than LMDE. Either way, I think it's mine. Now the question is not to get a new laptop but a new main computer - can't wait to change!
But of course, some little problems, even though up to now I've only installed Vivaldi and moved the vertical panel from one side of the screen to the other. Oh, and changed that Conky thingy...
1. Is it okay for the os to go online the moment it's loaded? I'd never let Windows do that before I hadn't my protection up.
(@ Condobloke - with protection I mean Shadow Defender or before that, TimeFreeze. They will virtualize the c: drive, put it in some kind of sandbox, so you can go online, do loads of nonsense, and then when you shut down the computer, everything is back to how it was before. Nice to have when trying out programs, too. I didn't run an antivirus ever since I figured out they were mere resource hogs. I trot out the on-demand scanners every other week or so, visit Eset or TrendMicro once in a while, and that's it. And my system is fine).
2. As for security, the integrated firewall is good enough? I left it on its default settings.
3. I noticed there seemed to be no portable programs. With Windows, I'm used to go for portables whenever possible. Anything that doesn't touch the registry is good. I usually install them under SD, save the resulting folder on another partition, reboot, and if they won't run, I won't use them. However, Linux seems to install everything, right into its root. Is that safe?
4. Another Windows damage is the horror of updates. If you let Windows updates run wild, the system blows up like a balloon. That's why I used WSUS Offline where smarter folks than me had figured out what was safe and actually required, ran it and that was it. Never had a Windows update again.
Now I did run a full upgrade on MX Linux because some guy on YouTube said so, but would I really need every one? This morning, it had found six new updates it wanted to have.
5. Windows damage again - what about services? I left them alone, of course - but are they something where people go and tweak? To make it faster, or leaner, or safer? Or just a bit lighter for an old machine?
6. When the system comes up (could still be a little faster...) it stops a while with these messages:
[ 0.185594] x86/cpu: VMX (outside TXT) disabled by BIOS
[ 2.942197] 1801_smbus 000:00:1f.3: Transaction timeout
[ 3.146190] 1801_smbus 000:00:1f.3: Transaction timeout
Could that be something that needs looking after?
7. Is there a way to get that Tuna Commander to keep the double pane view? Every time it comes up, it has a single pane again. It's a tidbit, really, as it takes just a click to have split view - but I'm just a Free Commander freak.
8. Where do I find network connection properties, that is the spot where I can change the dns server address to 1.1.1.1?
Cloudflare website says, "Go to Show Applications > Settings > Network" - but there is none in MX.
9. What exactly is the name of that start menu thing that looks like a Windows start menu? The first thing I ALWAYS install in a new Windows ever since XP reared its ugly head was Classic Shell - to get rid of that start menu... lol
10. Should I take the trouble and move or copy the Thunderbird data or should I wait until the 'real' MX Linux machine gets installed? I do have a row of web based email programs, so it's not that I couldn't get any emails. Not even sure if the Linux Thunderbird could read the data folder of the Windows Thunderbird. They're different versions, too, 52.6.0 (32-bit) vs whatever the new one is. It won't let me look without going through the whole setup process.
10. That's another thing - is there a program, like Free Commander, where you can look up everything that actually is on the hard drive, including programs, so you could go there and check, "Aha, Thunderbird, here's the readme.txt, it's version so and so". I did find Thunderbird in Tuna, but found no read me, could see no version info, couldn't make heads or tails from it all and went out before I broke something.
I'm aware it's beginner's blindness, but maybe there is just the program I need and just haven't found yet. I must admit it's a bit confusing as to what is installed, or what's merely a suggestion for the download center.
11. I wish I hadn't set a password. I swear that thing asks for authorization every time the cat walks by. Is there a way I can change that so it just asks for the log in or maybe the most utterly important things? I'm the only user here.
Again, thank you all so much, just for being there.
I'm sure it won't be long until the next row of questions and problems comes up...