Whatever you find most interesting ? If you find everything equally interesting try the one that you think would have the most direct impact on the world in th

Whatever you find most interesting ? If you find everything equally interesting try the one that you think would have the most direct impact on the world in the shortest possible time. I am a 3rd year student too, and I am working with machine learning and industrial robotics. However there are so many things out there in 2015 ! Cryptography for web, VR, etc.