The topic of Ethics, law and culture in a digital environment is new to Informatics, a subject supplemented in the 2018 Vietnamese general education curriculum. In primary schools, new textbooks for 3rd graders, including that of Informatics shall be introduced in the school year 2022 – 2023. It is essential to equip teachers and parents with basic knowledge to better understand this topic, thereby educating their primary-age children about cultural and ethical behaviors in a digital environment. In this paper, the author focuses on providing basic knowledge of personal information for the study and teaching of the topic "Ethics, law, and culture in a digital environment", which is covered by the Grade 3-designated subject of Informatics from the 2018 General Education Curriculum in Vietnam.