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I hope you meant to learn Unigraphics..
Well my friend the best way to learn any software free is the google and youtube especially you tube. There are many excellent lectures starting from begining to the latest advaced tools available in youtube. Many of such tutorials maintain high quality of teaching with their calm and composed presentations.
So if you want to learn anything google it or you tube it, trust me you will be surprised.
Siemens PLM website is the best source of information for unigraphics related information
Beginners can easily learn NX unigraphics by watching online tutorial videos of sketch, modeling, sheetmetal, drafting and assembly.
www.mitsucad.com is the site, where Beginners can buy tutorial videos or easily learn from this website.