What I want to learn about computer.

I want to learn skills what I use in the future. I know little be about computer and that is enough for now. However, when I got a job, I must know more about it such as how to make a presentation or project papers that is originated by using computer. If I knew them, they could be more wonderful and successful. Moreover, I like music but I don't know what can we do on computer with music, like burning CD or downloading songs. Computer has many useful tools so, I want to learn as many as possible about them to have more comfortable life.