1. Use a different password for each Internet site you visit
2. Use a combination of uppercase, lowercase, numberz and special characterz Pa1sS2Wo#rd_sA!fE(ty)
3. Store your passwordz off-line, as on a removable thumbdrive ... and remove it until you need it!
The admin of any site you visit can easily view your password ... even on sitez such as this one! An unscrupulous admin will get yourz and visit sitez you are known to frequent, and try to log in as you (using the password you used on that site); if successful, they can then do anything you are allowed to do on the site ... thingz you would not do, such as posting SPAM or linkz to inappropriate web sitez ... or embed a virus into certain typez of postz.