First, select your units, then your OS, and finally your area of interest!

Metric or Imperial
Mac or Windows OS
Categories of tutorials

It is free, just enjoy learning Rhino3D

First, learn about the interface of Rhino for Windows and Mac OS, then find the exercises that most fit your expertise:
  Exploring the Rhino3D Interface on Windows and Mac OS
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  Jewelry - Windows (Metric System)
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  Jewelry - Mac OS (Metric System)
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  Furniture Mac & Windows OS - (Metric System)
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  Furniture - Mac & Windows OS (Imperial System)
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  Product Design - Mac & Windows OS (Imperial System)
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  Product Design - Windows (Metric System)
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  Architectural Modeling - Designing Architectural Spaces - Windows & Mac OS (Imperial System)
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  Architectural Modeling - Designing Architectural Spaces - Windows & Mac OS (Metric System)
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  Mechanical - Windows & Mac OS (Imperial System)
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  Mechanical - Windows & Mac OS (Metric System)
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  Footwear - Windows & Mac OS (Imperial System)
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  Footwear - Windows & Mac OS (Metric System)
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  Lamps Mac OS & Windows - (Imperial System)
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