Identify this plant please

Can someone identify the following plants please? The lighter plant is quite rampant growing everywhere in the lawn.
The darker green one is of more interest though as it is popping up in the lawn and various sites and looks a bit like a cress, but would like to get other people's opinions.

Thanks in advance!

The first plant looks like buttercup....does it have yellow flowers. it is a bad weed and is not edile....it propogates by seeds, broken roots and runners

The second looks like it might be related to wild mustard. are the flowers shown part of the plant?

Thanks for the help and the flowers are part of the plant. When I tasted it originally it tasted like cress and after you mentioned wild rocket (which have yellow flowers it seems) I thought I would search on Google for "Wild Cress" and it matches it perfectly. Thanks for the help on that one.

The other plant is still one I would like to know about. It is not buttercups as there are buttercups growing down in the moist areas of the property and this is like a ground cover with very tiny flowers. So unless it is a variation of buttercup I am not aware of, it appears to be something else.