Allegro

What do you guys think about allegro?
I want to study this shit,but I don't know if I should go with 4.0 or 5.0;

Is allegro better than SDL?

CS student here
When I was starting out with C++ I made a little game with allegro. It helped me a lot learning C++.
I'm currently doing a little game with OpenGL, and I can say that it took me a while to grasp OpenGL.

Maybe this has something to do with that graphics class I followed last year, the teacher still used immediate mode to draw his polygons, it was all really confusing of what to use

my advice: OpenGL is pretty confusing in itself, you'd better master a programming language first