I learn:

1. English as a second language.
2. Statistics, I've got my bachelor degree from STIS Indonesia.
3. Mathematics but am not really good at it.
4. Computer science. Data science and PHP Programming are my favourite.
5. Writing. I'm a bit of a writer myself, in English and in Indonesian. This is my blog.

So far, I teach those five subjects both in Indonesian and in English. Especially English anyway, love to learn it, love to teach it, very much.