The rotation variables for the triangle and square in lesson 4: rtri+=0.2f; rquad-=0.15f; I didnt find any code that set them back to 0 when they reach 360 or -360. How is it that it continues to rotate properly?

They continue to rotate properly because all of the trig functions repeat themselves. sin(10) == sin(370) == sin(730) and so on. And I wouldn''t be surprised if OpenGL (you''re talking about NeHe''s stuff, right?) automatically wraps whatever you give it.

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They continue to rotate properly because all of the trig functions repeat themselves. sin(10) == sin(370) == sin(730) and so on.

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wrong, because the trig functions accept parameters in radians
but yeah thats how it works
when it overlaps it just starts over again

Oh, so the call to glRotatef(rquad,1.0f,0.0f,0.0f); would loop rquad back to 0 if needed?

Well, yeah. All standard C functions assume all arguments are in radians, but OpenGL wants everything in degrees.