http://blogs.msdn.com/b/davrous/archive/2013/06/13/tutorial-series-learning-how-to-write-a-3d-soft-engine-from-scratch-in-c-typescript-or-javascript.aspx

Here a cool series of tutorials to learn the basics of 3D by building our own 3D software engine (CPU based only) in C#, TypeScript or JavaScript. It goes from simple points to wireframe and flat/gouraud shading.