The thing I like the most about learning new things is how it widens my knowledge about what i already know. It also gives me new views to bring back to my coding in my "native" language and the other ones I already know.
Today I had fun learning more about GitHub pages by learning Jekyll. I also realized there's project pages, and user pages, which makes it immensely easier to make not just one but several portfolio sites. I can tie my domain name to host my site on Github. That's a lot of fun and very useful to a poor student like me.
Next on my list: Ruby on Rails!