Which is better for starting to learn graphics programming, DirectX or OpenGl ?

Answer 1

if I don't mistake, with DirectX you are limited to windows only

Answer 2

seamiki thanks for your answer. So OpenGl will be more appropriate when working with other operating systems ?

Answer 3

DirectX is easier but worse and restricted to Microsoft. OpenGL is much harder but also runs faster.

Answer 4

I think the understanding of computer graphics principles is a good place to start
https://www.amazon.com/Computer-Graphics-Through-OpenGL-Experiments-ebook/dp/B00L2EBLKG/
As opengl is used on more platforms than directx I would go with opengl.
Learning Modern 3D Graphics Programming
- this course is very good AND FREE !
http://opengl.datenwolf.net/gltut/html/index.html