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.
You could check out Spiral Linux for an “easier” installer. It has the option to use the Calamares installer from the live USB instead of Debian’s default. Also comes preloaded with back port repositories and, I think, Nvidia drivers.