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Well it is up to the author of the package to write the tutorial and if they didn't, then there isn't one. The specific package you refer is clearly marked as pre-release and therefore understandably doesn't have a tutorial.

I suggest asking for help on specific packages here at answers.ros.org and as you become more familiar with ROS it will become easier to look at the code and understand how they work. Again, ideally they would have tutorials for released packages.