Ok the one thing you need to remember is, wear you look is wear you go! One of the hardest tracks in Australai has a forrest section with a rock in their called magnetic rock. Want to know why it is called this? It is on the out sideedge of a chicane that looks like you can jump over it. If you look on the edge and see this rock, chances are you will hit it and hit flip into a bunch of other rocks and trees at considerable speed.

Just look where you want to go before taking off and while in the air. Depending on your style land both wheels at the same time so you can turn quicker than if your front wheel is in the air. Or land slightly front wheel first. If you do this do not land too hard and where your front wheel goes is where your rear wheel will go. I use this second method as I find it the most useful for downhill where every moment you can turn is an advantage.