No, seriously...

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All PS CC setup options are located under preferences...

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So where are these options?

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Under Menu>Edit>Preferences>General of simpler.. Ctrl-K  When we are done you will be sick of this section.  The pages that follow will address every option relevant to a photographer.  I will blissfully ignore the others.  Note that many of the settings are optional and depend of your needs, not of my recommendations.

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I am using a new install of PS CC to show the various screens you will be exposed to and the setup I use.  Note that what use works for me.  You must select what works for you.