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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 your friend is not tech savvy person, i would go with Mint XFCE (maybe Zorin OS Lite). Surely, it will be not as lightweight as Debian, but it will be much more user friendly for him
If he actually feel comfortable tinkering with OS - along side Debian maybe Bodhi Linux or antiX? I tried both of them on one of (in)famous Intel-based netbooks with 512mb RAM and they worked quite well.
With low specs like that, the experience will never be great, but with a very light desktop you can make it work. Debian is fine, but with some set up, Alpine could be one option. It's a really light distro.
VoidLinux
It is probably the best solution to the low memory problem, but it is also the least common and may be the most difficult.
I think Slitaz is still around, I always liked that for older machines, I was going to try it on an AMD C-50 laptop I pulled out of storage recently, except I don’t have time for messing around.
AntiX or Alpine
Fedora.
It seems to be easy to manage and fast to install.
SUSE is slow to run and self-update.
Debian is far behind and Ubuntu seems to always have an issue during or right after installation.
Lubuntu has always been solid for me for low spec machines.
With only 2 gb of RAM it will be slow, there is almost no avoiding that part.