Acquiring new fonts is easy; installing them is just as easy. You can install them manually, use the font installer that's included with many fonts, use a third-party installer, or use Font Book.
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Font Book has been the standard way of managing fonts in OS X since OS X 10.3 (Panther).
There are a number of third-party font management systems, but Font Book provides most of the features Mac users need, including the ability to add, delete, and manage fonts.
To change the default installation location, click the Font Book menu and select Preferences.
From the Default Install Location drop-down menu, select Computer.