what do you want to learn about PC??

want to learn about any things like very useful in daily life because I just know Microsoft office Word and so on that basic stuff. Actually, I don't know what do I need or what do I have to learn about. However, I have opportunity to learn many things about computer. If I have to pick one thing what I want to learn about computer in this class, is music stuff that is like how to use it. And I have to learn about power point and Excel because they are very useful for the work. My older sister is working right now in the office, which is in Shinjuku, and she always using power point for the presentation. Then she is using Excel also.