Yarrow leaves are more finely cut, IMPE, unless there are other cultivars I am unfamiliar with. I've seen a lot of the yarrow that grows like weeds in CA at my sister's house.

Thalictrum lucidum

Creeping buttercup, Ranunculus repens.

It's very difficult to ID many grasses without seeing blooms and closeups of leaves and roots, but that looks suspiciously like Sorghum halepense, johnson grass. Is that growing in a wild/unmown area? If it's a maintained area, you do NOT want johnson grass in it. It is a very aggressive spreader.