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This video is a tutorial on basic sketching and part modeling exercise, which is a good practice for beginners. You will practice sketching, creating extruded features and extruded cuts. This video was filmed by SolidWorks in 2011 but is applicable to later and earlier versions of SolidWorks.
 

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This video provides the basics on some helpful tips and suggestions about working with sketches in SolidWorks

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This video provides the basics on some helpful tips and suggestions about working with Sheet Metal Weldments in SolidWorks.

YOUTUBE
 
This video provides the basics on some helpful tips and suggestions about working with assemblies in SolidWorks.