Home - Unity-Technologies/EndlessRunnerSampleGame GitHub Wiki
This wiki isn't a tutorial but instead contain information on some specific part of the project that may be hard to understand by themselves only through code comment.
You can take a look at the the code walkthrough on Unity website for a first glance at the project architecture.
If you find a part of the project that would benefit from more in-depth explanation, you can create a new issue and assign it the documentation label