Complex passwords that are eight characters or longer and include a combination of upper/lowercase letters, numbers, and symbols are a great first step for keeping your information secure.
In the schools I have worked in, this has not been an issue for most students because they receive a strong password from the school, and in elementary they just receive a QR code to scan for their password. I think the more important thing to teach about digital citizenship is the sharing of passwords, as it is much more likely to be an issue among students.