I was wondering, what type of programming language do you need to learn to program OpenGL programs? Can i use C or C++?
any suggestion?(If can, you could include a sample of an OpenGL program with C/C++ combination) 
OpenGL is written in C (look up the OpenGL User guide’s ‘C’ glossary for a good laugh.)
C and C++ are the most commonly used languages.
There’s no problem to do OpenGL in any other procedural language and I’ve even seen OpenGL code in Lisp, though I hope I won’t see that again. 
Do a search for tutorial pages on the forum. (NeHe being one of the most cited here.)