To clarify a couple of things, BN is meant to be a good introduction to eventing. The jumps are made straightforward to give both horse and rider a good experience. If you read the ominbus you will see that some courses will be marked "good for first time" or more challenging. The purpose is so that one can begin at the easier BN courses then before moving up to novice they can attempt a more difficult bn. Then this process begins again everytime you move up. This is why I get so upset when people decide that they are going to move up to training at Stuart Horse Trials since that course is NOT A MOVE UP COURSE! From Novice to to training the technical parts of it are jumps on a angle, more difficult lines, the questions just become more specific, it is not so much about collecting and moving forward that is asked on all levels - you move forward in the open and then have to bring your horse back together for the jumps. That is not tech. That is part of cross country.
Back to the original question - I have attached a picture showing you what we mean by flag each level gets a color and you must jump the jumps with your color and the red flag is always on your right. You can not go around the jump you will be disqualified. IF you refuse you lose points so many refusals = elimination. Best place to learn about this is on usea website. (www.usea.com