High-quality preschool lays the foundation for a child's educational career. Preschool is where children are learning how to self-regulate, make friends, communicate, and express their wants and needs while preparing for their educational career within the K-12 system. If children do not have the behavioral and social-emotional skills needed to effectively participate in preschool programs, they are missing critical opportunities to grow and learn. Teachers and parents are often the "first responders" to address challenging behaviors and need knowledge, resources and support to nurture positive social-emotional development as a foundation of learning. This report includes resources to inform early childhood stakeholders at the state and local level interested in developing policy and guidance for programs to prevent and reduce suspension and expulsion. (author abstract)