Slightly off-topic here, but you might like the tdlr project[1]! It's community-maintained, example-focused documentation for common command-line tools. Currently, there are over 1700 pages, and it's very easy to contribute new pages or improve existing ones, because it's all in simple markdown on github. (For example, [2] is the source for the tar page.)

[1] https://tldr.sh/

[2] https://raw.githubusercontent.com/tldr-pages/tldr/master/pag...