While the provided documents do not directly list safety reminders for using A-frame ladders, here are three key safety reminders based on general safety knowledge:

1. Ensure the ladder is on a stable, level surface: Before climbing, make sure the ladder's feet are firmly planted and the ladder is not wobbly. Use ladder levelers if necessary.
2. Maintain three points of contact: Always have two hands and one foot, or two feet and one hand, in contact with the ladder at all times to prevent falls.
3. Never stand on the top two rungs: These rungs are not designed for standing and can cause the ladder to become unstable.