"For many new players, the most confusing part of Omaha Hi/Lo is determining the nut-low. In this game, straights and flushes do not affect the low. Thus, the best possible low hand is a wheel (5432A). Furthermore, it is important to remember that the low hands are counted from the top down. A player with 8432A (an 8 low) would lose to a player with 76543 (a 7 low). This surprises most players who instinctively think that 8432A wins due to the ace as the lowest card."
Think I may understand it now. Next on my list to learn is razz.