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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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If I remember correctly, you can define the modifier key in KDE. Not sure though, you might have to test it out.
That would be the fastest way. Apart from that, it's very much possible by binding every possible action to different keypresses. That would be long and stenuous.
I think, what you're describing used to be a thing, but there's now a somewhat different, more granular way of rebinding keybindings:
However, it should be said that these will only apply within KDE applications. If you're using third-party stuff, like Firefox, GIMP, VLC etc., they won't apply.
If you really want to go hard on rebinding all kinds of keys for any application, you can also do things like these:
As cool as both of these are, and as much as I would still generally recommend picking KDE for these kind of customization possibilities, I wouldn't recommend overdoing either. You won't be able to use other PCs anymore...
If it helps, the Windows/Linux logic is basically:
Well, and Ctrl, Alt, Shift also serve for alternative characters when you're typing. And some application or OS shortcuts wildly combine modifiers for more complex keybindings. And of course, some applications just didn't get the note of how this generally works. I won't claim, it really follows rules, but yeah, it's not generally complete chaos either.