As mundane as it may sound, choosing high-quality passwords for yourself, and "encouraging" (that is, mandating that) your users to do the same, is a cornerstone of good security. Remember to avoid common words and names, especially any that are related to you such as the name of a friend, where you work, or your pet's name. Also avoid guessable numbers such as your birthday or anniversary. Instead try to use random combinations of letters, numbers, and punctuation.