Create or find a classroom resource that teaches students about creating strong passwords, passcodes or passphrases.
For middle to upper primary students this YouTube video would be a good starting point to explain why passwords need to be strong. https://www.youtube.com/watch?v=9LxdtaSvQ3I
This could then lead into students working in groups passwords that they think would be common or easy to guess. Then they could test these passwords using the how secure is my password website https://howsecureismypassword.net. This could then lead into them creating passwords they believe would be harder to guess – the teacher could have a 5-minute challenge to see who can create the hardest password to crack.