Question

Write short note of Precaution in instruction .

Answer 1

Precaution means something you do in order to prevent something dangerous or unpleasant from happening Fire precautions were neglected.
as a precaution
The traffic barriers were put there as a safety precaution.
precaution against
Save your work often as a precaution against computer failure.
wise/sensible precaution 

The trails are well marked, but carrying a map is a wise precaution.
Vets took precautions to prevent the spread of the disease.
take the precaution of doing something
I took the precaution of insuring my camera.