This 3-page document describes the main parts of this season...Core Value, Robot Game, and Project.
Sometimes it helps to see the Robot Game model and how they need to move. This video from FLL Team 9646 does just that. http://safeYouTube.net/w/R7Mb
This is the full Challenge Guide. It is essential to refer to this (and the Challenge Updates) for exact details throughout the season. It becomes more familiar the more you read through it. https://firstinspiresst01.blob.core.windows.net/fll/hydro-dynamics-challenge-guide-letter.pdf