Determining Low hand ranks is more unique, but no more complicated.
Low hands are ranked using the California system, meaning straights & flushes don’t count against a hand, pairs & three/four of a kind do count against the hand, and Aces always count as a low card.
Using this system, unpaired hands are ranked beginning with the hand’s highest card (for example, 2, 3, 5, 6, 7 would be “7-low”)
The best possible low hand is known as “the wheel”: A, 2, 3, 4, 5 (5-low).
The next best possible hand would be A-2-3-4-6 (6-4 low.)
The latter hand would lose to the former because 6 is higher than 5. This same pattern continues throughout the deck: 6-low beats 7-low, 7-low beats 8-low, etc.
While flushes and straights don’t count against your hand, pairs do. This means that the lowest pair (e.g. A-A-2-3-4) would still lose out to the highest single-card hand (e.g. 9-10-J-Q-K).
In short: stay focused on low cards and avoid pairs & three/four of a kind – lowest hand wins.