Herbicides should be one tool in a total weed control program. Ultimately, the best way to keep weeds from being established is the development and maintenance of a dense, flourishing lawn. Healthy turf prevents sunlight from reaching weed seeds ready to germinate, and minimizes the available space to establish themselves in the first place.
The first step in winning any war is by knowing the ways of the foe you are about to face. He may not have been talking about weeds, but in his military treatise “The Art of War,” Sun Tzu put it best: “If you know the enemy and know yourself, you need not fear the result of a hundred battles… your victory will not stand in doubt.”