I have a bunch of weeds in my garden. Two weeks ago, I sprayed part of my yard with what I was told was weed killer, but it turned that part of my lawn brown! I'm looking to identify what sort of weeds I have, and what would be the best weed killer to use that will kill only the weeds and not my grass. My lawn is about 3500 sqft. I also do have a portable multi-use tank sprayer. I have attached 3 photos of the weeds I have. The first one contains all the weeds, plus a pen for size reference. The next two photos are close ups of the weeds. I believe the first weed on the left is Horsetail. The next one looks like a piece of grass, but grows at 6x the speed of my other grass. Not sure if this one is a weed, or a super grass.