Social and emotional learning (SEL) is difficult work. It requires thinking and talking about ongoing emotions and relationships, topics that are complicated and sometimes taboo. This field guide presents curriculum features (organizational practices that support SEL) and standards for SEL practices (things staff can do with youth), that aim to help adults teach youth how to encounter, understand, and surmount challenges, and experience success within the context of strong positive relationships. The standards for SEL practices are described in terms of key youth experiences and staff practices.