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Get help from youtube. Also help files of Inventor is useful.
If wish to study online I can help you. Give a mail: kebymathai at gmail.com
The best way to get tutorial is from AutoDesk web itself. Below is link for Autodesk Inventor tutorial:
https://knowledge.autodesk.com/support/inventor-products/learn-explore
AND
https://knowledge.autodesk.com/support/inventor-products/getting-started