Would I be right in thinking all 3 are weeds, or is the one in the top picture a plant?
The top one is an oxalis, I don't know which one.
Red dead nettle and chickweed at the bottom
Depends on your gardening style. I like some dead nettle and chickweed about
I've got both...always seem to get red dead nettle after the soil has been dug but its a pretty little flower
Chickweed is a lovely salad green in the spring - it also goes very well in a sandwich with some egg mayo
Whether something is a weed or a wildflower is all in the mind