Garden Yellowrocket is a cool name for a rather weedy plant. Another name is Bittercress, presumably because the leaves are edible, yet bitter.
This plant is an alien from Eurasia. It’s quite common and prefers disturbed areas and “waste places”, which are quite common.
The basal leaves are a key to identifying this plant.
They have only 2-8 lobes whereas Early Yellowrocket (Barbarea verna) has more than 8.
A whole field of Yellowrockets in the springtime is quite colorful.
Garden Yellowrocket is in the Mustard family, Brassicaceae, and has four petals like all the rest of them.