14. When descending stairs, keep your hands by your sides.

Reason: It’s regarded as courteous.
An exception would be if you needed to grab onto the railing for security.
As stated on this list, royal women are expected to stand with their chins parallel to the floor while they descend stairs. An arm-related rule for descending stairs is also in place.

When descending stairs, you must keep your hands by your sides. ©Serge Lemoine via Getty Pictures
It’s considered courteous to keep your hands by your sides when descending stairs. We’re sure they make an exception for elderly or dangerous staircase family members—why risk a fall?