Mostly rock and classic rock. Then of course there are all types of other genre mixed in. It really depends on the song. For example, I am not a big fan of rap, but it doesn't mean I don't like any music with rap. I also like some pop, techno, and dubstep music.
As for instruments I know how to play? I assume you mean can actually play a musical piece on the instrument in which case, piano. I do know how to play other instruments though, as in if you handed me a violin, a trumpet, flute, or whatever instrument and gave me about a week, I could at least play part of a musical piece by then. With little to no help or instruction.
I think learning to play instruments isn't all that hard. When it comes to music, the hard part is making your own compositions. I have been learning a bit on how to do that since I am currently making music for a video game I am working on.