Faster than the ribbon
The fastest way to get things done on computer is through keyboard shortcuts, and these are the ones I use often. (Depending on the software, certain ones might not work.)
Ctrl+W to close the current window; I press Ctrl+W repeatedly to close all windows in the current program; when there are no windows left open, then the final Ctrl+W closes the program.
Alt+Tab to switch to the next program; I use Alt+Tab to quickly switch between two programs I am using at the same time.
Ctrl+Tab to switch to the next window inside the current program
Windows+Right-arrow makes the current program take up the right half of the screen; I use this one to quickly size Windows Explorer, so that it takes up a half-screen. Pressing this key combo repeatedly places the window in different locations, including on the second monitor.
Alt+PrtScr to make a screen grab of the top-most window or program or dialog box; actually, I now use WinSnap instead of the Windows screen grab utility and so I programmed it to use Ctrl+Spacebar to make screen grabs
Tab (instead of Enter) to quickly move between fields of a form, such as on a Web site; press Shift+Tab to move backwards through the fields.
Esc to cancel something, such as getting out of full screen in a browser (press F11 to get the browser into full screen mode)
Ctrl+B, Ctrl+I. and Ctrl+U for boldfacing, italicizing, and underlining text
Ctrl+C, Ctrl+X, and Ctrl+V for copying, cutting, and pasting elements to and from the Clipboard
Ctrl+A to select everything
In the word processor I use, Atlantis, I press Ctrl+Alt+Ins to paste text unformatted.