Some of the applications in Microsoft's Office 2013 suite launch with a start screen by default. On the left side of the start screen is a list of recent documents and on the right side, a list of templates. It's a useful feature, but if you prefer, you can bypass the start screen and go right to the edit screens of those Office programs (Word, Excel, PowerPoint). Here's how:
From within the main edit screen, go to File > Options or use the keyboard shortcut, ALT+F, T. Under the General Options tab, go to Startup options and uncheck the box next to "Show the Start screen when this application starts." Perform the same steps for each of the applications in the Office 2013 suite.
The next time you launch your Office application, you'll get the editor first, rather than the start screen.
That's it. Remember that you'll need to make the change in each of the Office 2013 applications where you want to disable the start screen.