Behance is the first stop of every designer's journey. It is free, and is not exclusive (unlike Dribbble). It is an online art gallery, so to say, where you can browse art works, get to know artists and feature your own work.
I conducted a Heuristic Evaluation of Behance (Website).
A Heuristic Evaluation is an inspection method in which you systematically apply heuristics (qualitative guidelines) to find and explain problems. I applied Jakob Nielsen's 10 heuristics in this project.