If you have a system that is used by other people, you may want to give them managed user accounts and then reserve a separate administrative account for installing apps and changing system settings. This is especially true for situations where many people may be using one computer, such as in classrooms. While you can always create an administrative account, by default such accounts will show up along with others at the login window, in the Fast User Switch menu, and other locations; however, you can set this up to be hidden from most of these locations. Continue reading
How to create hidden administrative accounts in OS X
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The password on your Mac is the primary way you will secure and prevent unauthorized access to it. If you suspect your password is compromised, decide you wish to use a different one, or have forgotten it, then there are several approaches for changing it. These range from the use of the standard system preferences, to various approaches with the Terminal, and finally with use of the Recovery and Single User modes on your Mac. 
