Linux / Unix: Find Hidden Directories, Files and Folders

I‘m a new Unix user and trying to find the hidden directory called .movies but I do not know where it is on the file system. How do I find a hidden folder or directories under Unix like operating systems?
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Ubuntu Linux: Add a User To Group

How do I add a user to group under Ubuntu Linux operating system using command line options?
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HowTo Install firefox-4.0.tar.bz2 in Linux

How do I install latest Firefox version 4.0 in Linux operating systems?
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Linux / UNIX: Change Bash To KSH Shell

How do I change my current login shell from bash to ksh under Linux or UNIX or Apple OS X operating systems?
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Linux / UNIX: Restrict Access To A Given Command

How do I restrict access to a given command for instance /opt/apps/start, to authorized users only under Linux / UNIX / BSD operating system?
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PostgreSQL add or create a user account and grant permission for database

How do I create a user account called tom and grant permission for database called jerry when using PostgreSQL database?
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Linux Login as Superuser ( root user )

How do I login as superuser or root user in a Linux operating systems? How do I become superuser in Linux?
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su command