The challenge is asking you to check if the string have the required format, the strings have to be greater than 5 characters long, do not begin with numbers, and have two consecutive digits.
passwords are mentioned to show a possible usage (have you ever tried to create a new password, and the page keeps telling you that it is too short, you need to add certaint characters and such? that can be done with regex)
if you want to learn about passwords, you can google about them, but you do not need a deep understanding of passwords for this challenge