I want to learn a Distro for fun.
Are you just using this laptop to dip your toes into Linux and see if you like it? I would recommend Debian + XFCE. It’s lightweight, it prioritizes stability over new features, and it’s a fairly easy UI for a newbie to understand. Alternatively Linux Mint MATE Edition might be worth a try. It’s also lightweight but is a bit more “up to date” than Debian feature wise.
Debian gets feature updates significantly slower than other distros, instead it focuses on insuring stability and security. It’s rock solid.
Linux Mint is actually based on Ubuntu (which itself is derived from Debian), so for the most part the two are fairly similar. There are a few key differences but for someone learning Linux you don’t need to worry about them. Pick one of them, get your feet wet, and then google the differences to see if you want to switch.
After all, endless Distro hopping is a right of passage for all fledgling Linux users! :)