For example, I’m using Debian, and I think we could learn a thing or two from Mint about how to make it “friendlier” for new users. I often see Mint recommended to new users, but rarely Debian, which has a goal to be “the universal operating system”.
I also think we could learn website design from… looks at notes …everyone else.
The Debian Wiki would actually like a word.
There is stuff in there that’s not found anywhere else. For example while researching driverless printing recently I found a huge page on the Debian Wiki but the Arch wiki only has a paragraph saying supporting printers should be detected automatically.