I picked up the rudiments of Sanskrit enough to be able to understand lectures in the language and read straightforward prose. I also gained a basic understanding of Indic philosophy, but I suppose that is not a skill. Now my aim is to deepen these skills to more advanced levels.
Currently I am also trying to learn Physics and Mathematics at the undergraduate and post-graduate level. It's taking forever because I keep getting distracted with life generally. But my aim is nothing less than gaining a solid grasp of our current modern understanding of how the universe works. I hope to get somewhere respectable by the time I am 45.