I am a beginning to enter the world of game development.

Lately, I researched that "OPENGL" is one of the tools to use in graphics, then I found out about "SFML" (I think that its a library or something that uses opengl).

I am so confuse because all books/ sites said using "GLUT", but many people/fellow developers said that I must use a more updated one like "SFML" but sfml has few/none tutorials.

What I am trying to say is "how to create own library or something like your own glut or sfml", and why does opengl has no source code? And how can I use the EXACT(not glut/sfml) opengl in my c++ program?

I am so confuse....