The 21st century has brought many technological, social, and educational changes. These changes affected teachers, including kindergarten teachers. Today, resilience and social-emotional skills adapted to the 21st century are required besides cognitive skills and knowledge. These skills must be integrated from early childhood education into the learning process of students and teachers alike, so graduates of the educational system will successfully cope with life's challenges and the variety of professions. Socialemotional learning is a theory that meets these requirements and enables educators' and students' personal and cognitive growth. Its principles can be learned and applied at any age, from childhood to adulthood. The theory is based on positive psychology and the five-factor personality model (FFM). It presents a systemic approach that develops a learning, egalitarian and participatory environment for students, families, and the community. Only trained educators who will advance the educational processes can create optimal change. The discussion in this article will focus on kindergarten teachers as educators. It will review recent studies on how social-emotional learning skills contribute to kindergarten teachers' well-being and reduce stress levels. Maintaining kindergarten teachers' good personal and professional well-being is essential for good relationships with children and improving self-perception, which is also related to physical and mental health. It was found that the mental resilience and personal well-being of kindergarten teachers directly affect the management of the kindergarten and the ability to respond to the children's emotional needs and thus affect the kindergarten climate, the children's behavior, and academic achievements.