The software documentation includes usage guidelines and examples

The documentation should include examples of the software features and guidelines on how to use it.

In the early stage of a software project, or for novice and beginners, this guideline is useful to precisely define the application scope of a codebase.

When the software will gain in maturity, and developers in expertise, the documentation will improve accordingly.

It also a good practice that advanced and expert maintainers, or for software seeking a viable, structured, robust (and above) research software maturity level to produce/publish tutorial material (eg: notebooks, presentation, video, etc.).