This creative website will tell you everything you need to know. This reaches from making your Macbook talk to games. This is only available to Macbooks to make this guide useful. This guide is updated often so keep coming back for some information.
The first step before you do anything is to open Terminal by either opening spotlight and typing "Terminal", go to your launchpad, find Terminal and open it by clicking on the application once or if it is in your Dock, open it. If it doesn't open, either follow the instructions on the screen (if it appears there) or restart your computer. When I tell you to type a word or words, it will look like this e.g: Type "emacs". Type the words inside the speech marks exactly the way it is.