“Rhino can create, edit, analyze, document, render, animate, and translate NURBS* curves, surfaces, and solids, point clouds, and polygon meshes. There are no limits on complexity, degree, or size beyond those of your hardware. ”
– from the Features page on the official Rhino site

“NURBS, Non-Uniform Rational B-Splines, are mathematical representations of 3‑D geometry that can accurately describe any shape from a simple 2‑D line, circle, arc, or curve to the most complex 3‑D organic free-form surface or solid. Because of their flexibility and accuracy, NURBS models can be used in any process from illustration and animation to manufacturing.”
– from the Nurbs page on the official Rhino site
 

Tutorials

• From BSU/CAP:
  • Using the CageEdit Command to Distort a Surface
  • Adding Thickness to a Surface
  • Trimming a Closed Polysurface (Solid) and Keeping it Closed
  • Creating a Waffle Model – Part 1: Slicing with Contour
  • Creating a Waffle Model – Part 2: Creating Notches
  • Creating a Waffle Model – Part 3: Preparing for Laser Cutting
  • Creating a Waffle Model – Part 4: Generating Diagrammatic Geometry
• From other sources
  • Individual Commands
    • Flowing Objects Along a Surface (FlowAlongSrf)
• General Tutorials
  • Lynda.com Courses on Rhino
  • Tutorial Resources on the Official Rhino Page