These proceedings present a selection of papers from the ICTTE 2021 conference. While face-to-face classroom instruction is brought back, there are a lot of lessons learned from the COVID-19 pandemic that schools, teacher training and education institutions, and government have to take into account. There is a need to reconsider what additional knowledge and skills pre-service teachers and in-service teachers need to be prepared for to anticipate such a similar unexpected situation in the future. Additionally, there is also a need to listen to in-service teacher experiences during the emergency remote teaching and integrate the positive lessons that they have gained, such as the use of technology, into the current post pandemic face-to-face classroom instruction. This proceeding is designed for teacher educators, researchers, in-service teachers, and pre-service teachers in the field of language education, math and science education and social science education, who are interested in these topics.