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Solidworks newbie to FreeCAD
(hexbear.net)
The best way to get familiar with it is honestly to just use it. Your knowledge of the general CAD workflow will translate, but FreeCAD definitely does some things in quirky ways, and the only way to get familiar with them is to use them. The FreeCAD forum is a great place to go for help.
Your own 3D parametric modeler.
FreeCAD is an open-source parametric 3D modeler made primarily to design real-life objects of any size. Parametric modeling allows you to easily modify your design by going back into your model history and changing its parameters.