Clean the crack with a wire brush or vacuum
Remove loose debris, dust, and damaged concrete
Widen narrow cracks slightly with a chisel if needed
Dampen the area if using a cement-based repair product
Apply a concrete crack filler, epoxy, or patching compound
Force the material deep into the crack with a putty knife or trowel
Smooth the surface flush with the surrounding concrete
Let the repair cure according to the product instructions
Seal the repaired area if needed to prevent future moisture damage
Monitor the crack for movement or widening
Call a professional if the crack is large, structural, or actively growing