So my wife has a 10 year old low end notbook. 500Gb of storage (HDD), 2GB of GDR3 RAM, and an intel Celeron Processor N2806. It originally came with Win 8, then she "upgraded" to win 10 and after that it was pretty much unusable. I am talking CPU and Ram about 80-90% in idle, opening a browser got everything down to a crawl. She mostly used it a storage and brwosing, watching youtube and occasionally to write. So I (also a Linux newbie) finally got the time to install a newbie friendly Os (Fedora) and it's so much better! I am Talking 20%CPU usage and 50%(?) RAM in idle.
Lububtu is another lightweight distro for old devices. I've used it before on very old devices and it's great!
Lubuntu, kubuntu, xubuntu…I’ve gone from Lu to Xu, but I think I’ll end up with ku because PipeWire and wayland and flatpak (I get the impression that they’re the way forward for the next while…). They’ll make pretty much anything work better than whatever windows version retired them.
Kubuntu has been the best Ubuntu for a while, the mainline keeps going further and further down the bad way.
Still, debian is good too.
I used Lubuntu before, but I since switched to Xubuntu. About the same performance but much better usability.