Better traction on concrete
If you're concerned about potential falls from slipping on concrete steps, consider painting them with a special non-slip additive. Paint stores sell inexpensive additives that you mix with a gallon of any type of paint or solid-color stain to give you better traction on concrete surfaces. The additive won't change the color of the paint or stain, but it provides texture to improve traction. Don't expect a completely slip-resistant surface.
Stir the additive into the paint (one package per gallon), then apply the paint with a paintbrush or roller. If you're applying more than one coat, put the additive in the final coat.