I had to have a new septic tank installed last year, a lot of fill got spread out over the yard. Any lawn will look good for a few days after it is just cut so I usually just leave it alone. After getting the tank installed, however, I figured that I would get the lawn off to a good start, then I would let it go to weed.
I seeded it, weeded it and fertilized it. It was the only green spot in my area during the winter. Guess what? The deer visited my new lawn every night during the winter. Now it looks like it is covered with divots. Derrrrr!