[ivansavz]

Wow this is an awesome online book. Goes into a lot of details, and uses words to convey the important things + supports it with code.

Another good tutorial, more specific to OpenGL, is this one: http://www.songho.ca/opengl/index.html I liked this one because each lesson has a binary you can download and run on your computer (only tested on Mac).

[Narishma]

I wouldn't recommend that one. It teaches the old deprecated fixed function OpenGL.