The Guidelines for Teachers on Online and Blended Learning are part of Innovation Station: A New Approach Towards Online and Blended Education. This project is coordinated by the Organising Bureau of European School Student Unions (OBESSU). Innovation Station is a response to the needs and challenges experienced by educators and secondary school students across Europe during the COVID-19 pandemic. The sudden onset of the pandemic forced educators and students to rapidly adapt to an online and blended learning environment. This transition was smoother for some than for others. Most schools, educators, and learners found themselves in a situation where they had to experiment and work with the tools available at the time.