I also like SliTaz: http://slitaz.org/en, and Slax too: https://www.slax.org/
Oh and puppy Linux, which I could never get into but was good for live CDs: https://puppylinux-woof-ce.github.io/
And there's also Alpine too.
Before encryption by default, get files from windows for family when they messed up their computers. Or change the passwords.
Before browser profiles and containers I used them in VMs for different things like banning, shopping, etc.
Down to your imagination really.
Not too mention just to play around with them too.