What is the best way to ensure a ladder is secure and won't slip?

The best way to ensure a ladder is secure and won't slip is by ensuring it is placed on a flat surface. A level and stable foundation is critical because if the ladder is on an uneven or sloped surface, it can lead to instability and increase the risk of slipping or tipping over, regardless of other measures taken.

When a ladder is firmly positioned on a flat surface, it aligns correctly, distributing weight evenly and maintaining balance. While additional supports, rubber mats, and tying at the top can improve stability, they cannot compensate for a fundamentally unstable ladder placement. Therefore, starting with a proper setup on a level surface is the first and most effective step to prevent accidents while using a ladder.