Re: Weed of the grass
One more thing grass is always greener on the other side of fence. When I bought this house , the lawn had bare patches, and the lawn of my neighbor used to look so gorgeous from my lawn. Then once I walked over to his lawn and I found that his lawn had bigger bare patches then mine. So your neighbors lawn might look like weed free but if you go close enough you might find weed there. Or he is following the same formula I do and many others do.
The university in your area might have some kind of specific information for lawn care at their website try that too. I learned everything from website of local university.