The plant in your photo looks like hairy bittercress. It is a winter annual weed that germinates in the fall. At this point, hand pulling or weeding with a tool before the seeds disperse is the best option.
Lawns that are not dense or lawns are mowed too short or are in shade allow hairy bittercress to outcompete the lawn.
Here are links to our website for more info on this weed and maintenance practices.