The first day of school is a joyful and anxious time when children need support. This all-Ukrainian lesson is about the importance of mental health. Experts will explain to children how our emotions work, show them simple exercises to calm down in stressful situations and tell them how to overcome fears and anxiety associated with the start of the school year. The lesson materials were developed within the framework of the All-Ukrainian Mental Health Program "How Are You?" (https://www.howareu.com/), initiated by the First Lady of Ukraine Olena Zelenska, in cooperation with the Coordination Center for Mental Health under the Cabinet of Ministers of Ukraine, the Ministry of Education and Science of Ukraine, the Association of Innovative and Digital Education, and the MEGOGO Education media service with the support of the United Nations Children's Fund (UNICEF) in Ukraine.