Garlic mustard, Alliaria petiolata. Very invasive, not native. Get rid of it if you can.

Ohhhh, yeah ... garlic mustard. Get rid of it, as much of the root as possible. You will want to keep an eye out for new seedlings, as the seeds can remain dormant, bur viable, for up to 10 years.

I've heard this is an edible plant, beloved by foragers, but I've never tried it and would advise proceeding with caution if you are tempted to do so.

My son's Boy Scout troop spent a day rooting this stuff out of a native garden in a nearby park. Extremely invasive, will out-compete everything around it if you let it. The best time to pull it is before it sets flowers because once it flowers, the little seeds go everywhere. When you do pull it, bag it separately and put it in the trash, not with yard waste.