Some examples of liked&known GitHub Repositories.

Fish

• It has a FAQ page which is interesting to me.
• It has very good documentation on https://fishshell.com/ and issuing system of it works well.
• It uses gitter and/or irc to take other user's questions which is very interesting.

FastAPI

• It has many tutorials, and examples of usage of it.
• It uses a different documentation place that is rather than github wiki, it uses https://fastapi.tiangolo.com/ to document itself.
• Main reason i like it that, It has "Opinions" section on wiki&readme that shows some people's opinions about api.

ReactNative

• It is from a huge company as Facebook which took my interest.
• It has very well documentation on https://facebook.github.io/react-native/ and resource.
• It has a showcase page which is very good for an app to show its importance.
• Main reason i pick this, it has very wide community that contributes to its development which is interesting to see for an open-source.