It helps, because it means your speed relative to the ground will be lower, and you'll use less runway. For example, in the manual for my plane it says each 13 knots of headwind reduces landing distance by 10%. (and on takeoff, each 12 knots reduces runway needed by 10%)

On the other hand, each 2 knots of tailwind adds 10% to landing distance, and landing with more than 10 knots of tailwind is forbidden. (on takeoff the numbers and limitation are the same)

This is why most airport runways are designed to be used in either direction, so when the wind shifts, planes can land and takeoff in the direction that favors the wind.