Everyone will have this weed sooner or later. But once you get it, and you can get a lot of it. There are a few easy things you can do to keep it from taking over your property.
Most important is to never let it go to seed. Pull it, mow it, weed-wack it. Just don’t let it go to seed. If it does go to seed you will have hundreds-thousands-millions-billions of little baby garlic mustards growing. You can either hoe them, or spray them with any weed killer. More will return as the seed can live for up to 5 years. You can use a pre-emergent such as preen to control future infestations.