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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 you're frequently distro-hopping, I recommend using a seperate /home partition. I did that before I settled down, I can't begin to describe how convenient it was (especially if you use Flatpak).
Copy them to an external drive or another computer, copy them back after.
Chances are you're gonna wanna wipe the partition table on your switch over so I'd just copy them out then back in. No point over complicating things.
Just to add: some folders' files might need modifications in the new system, e.g. .config/
Yea, I was gonna say, have ya not heard of backups ? but this is better.
Just remove every directory except for /home/. Then install the new OS without repartitioning.
I'd be careful, not every distro plays nice when you do this. In my experience at least.
WHY THERE ARE NOT.
Please have a partition for /home. In fact, you need partition for /usr, /var,.. too
Why? Serious question. I kind of understand /home, but why the others? I used to do it a bit, but now I don't bother. I never knew how big to make each partition, and have had problems where something like /boot fills up and freezes the system.