I am student and want to learn openGl so which tool is easy for me … i mean for basic level of learning …
Might as well use GLUT. Easy and straightforward. There are several others… GLFW, SDL, etc. Should be able to find info about it on google as well as through FAQs section from main page of this site.
If I was you I would head over to http://www.gametutorials.com and check out the windows basecode code (heh) if your programming under windows. I found GLUT and GLFW to be extremely limited in comparison.