Arduino Education
https://www.arduino.cc/en/Main/Education

Avocado Electronics – Arduino for Schools
https://avocadoelectronics.com/arduino-for-schools/

Arduino-based Master Clock for Schools: 9 Steps
https://www.instructables.com/id/Arduino-based-master-clock-for-schools/

Arduino Project Hub – 89 kids projects
https://create.arduino.cc/projecthub/projects/tags/kids

Electronics Hub – 10 Simple Arduino Projects For Beginners with Code
https://www.electronicshub.org/simple-arduino-projects/