What I want to learn about the computer

I am not good at use the computer; therefore, I want to get the knowledge of the computer as much as possible, but I would like to learn about especially how to do presentation with the computer. When I was a junior high school student, I have made presentation with the computer. At that time, it was fun for me; however, it was also difficult work to me; therefore, I could not remember its process, so I want to learn how to make presentation to use the computer again. Also, if I could master that, it is helpful my speech when I have to do that. Then recently, there are many computers in our society; therefore, I need to use the computer perfectly in the not only college but also other places, such as companies, so I want to learn about the computer during the class from now on.