Ladders are tools.  Many of the basic safety rules that apply to most tools also apply to the safe use of a ladder:

*  If you feel tired or dizzy, or are prone to losing your balance, stay off the ladder.
*  Do not use ladders in high winds or storms.
*  Wear clean slip-resistant shoes.  Shoes with leather soles are not appropriate for ladder  use since they are not considered sufficiently slip resistant.
*  Before using a ladder, inspect it to confirm it is in good working condition. 
*  Ladders with loose or missing parts must be rejected. Rickety ladders that sway or lean to the side must be rejected.
*  The ladder you select must be the right size for the job.
*  The Duty Rating of the ladder must be greater than the total weight of the climber, tools, supplies, and other objects placed upon the ladder.
*  The length of the ladder must be sufficient so that the climber does not have to stand on the top rung or step.
*  When the ladder is set-up for use, it must be placed on firm level ground and without any type of slippery condition present at either the base or top support points.
*  Only one person at a time is permitted on a ladder unless the ladder is specifically designed for more than one climber (such as a Trestle Ladder).
*  Ladders must not be placed in front of closed doors that can open toward the ladder. * The door must be blocked open, locked, or guarded.
*  Read the safety information labels on the ladder.
*  The on-product safety information is specific to the particular type of ladder on which it appears.
*  The climber is not considered qualified or adequately trained to use the ladder until familiar with this information.