Across the country, school reformers are pushing for the expansion of publicly funded early education. In New York, Mayor Bill de Blasio, who won the Democratic mayoral primary on Sept. 12, ran on a platform in 2013 centered on the expansion of prekindergarten education to all 4-year-olds; now, in a proposal he is calling “3-K for All,” he plans to reach 3-year-olds, as well. The science is clear: Quality early education has long-term benefits. Still, not everyone is on the same page about what young learners really need. Below, one writer examines the landscape of prekindergarten education across the country, another instructs adults on how to understand young children, and a third will be a resource for parents in the process of selecting a school for their child.