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[–]forscher 1 insightful - 1 fun1 insightful - 0 fun2 insightful - 1 fun -  (0 children)

Or learn them by reading a book.

This one, e.g.: https://www.pdfdrive.com/the-debian-administrators-handbook-debian-squeeze-from-discovery-to-mastery-d184607480.html

Because learning these this oldschool way actually enables you to remember which password you used where.