What skills should I learn?

Now that summer has started, I am looking to learn a new skill along with other activities but am not sure exactly what I want to do. I want it to be related to finance/econ and I am not interested in investing (which is a popular finance activity but I have tried it before and didnt like it very much). If anyone has any advice of something interesting that I could possibly learn that would help for my intended major, that would be great. Thanks!