Hi! I'm taking over after a few years of a lawn service and wanted to get some basic information about the weeds, etc. I'm finding before I start to treat them. Attached are two versions of the issues we have in our yard. What are these and how do I best treat them? (Pics by the sidewalk and in my hand are the same item, second pic is of the humps of grass - found sprinkled throughout the lawn) Thank you!