Here's the link to their rally school. Pretty cool as it will be geared more towards dune riding and dune navigation; something that I haven't done before. Dunes are all "HP" or off-piste (hors piste) so they typically will lead you into the dunes at some point with just a cap heading or compass direction (e.g. 180 degrees) and then you maintain that heading for a specific distance but it could be something like 26 miles or so before your direction will either change or you exit the dunes. Typically waypoints will open up when you reach a certain distance which could be something like 800-1000 meters and then the arrow pops up on the Rally Comp computer (I think that's what they're using) and the arrow directs you to the waypoint.
Key to dune riding is obviously speed and momentum but it's also in reading which sides of the dune you want to ascend & descend based on the direction the sand has been blown. Key skills are things like knowing how to turn your bike around and back down a dune you're not likely to crest (saves a ton of energy digging it out), cresting a dune, avoiding "witch eyes" or softer hollows of super fine sand that are good at stopping your bike with you continuing over the handlebars.