Navigating the Viewport

Problem

You want to scroll through a document in screenfulls; not line by line.

Solution

Command	Scroll To
`H`	Top of the screen. (Mnemonic: Home).
`L`	Bottom of the screen. (Mnemonic: Lower).
`M`	Middle of the screen. (Mnemonic: Middle).
`gg`	Top of file.
`G`	Bottom of file.

Discussion

If your file is longer than the height of your window, you'll need a way of scrolling the portion that appears on the screen.

The area of the screen displaying a file is called the viewport. As we scroll down the document using j, the viewport updates to hide the line at the top, and show a new one at the bottom. Scrolling through a long document this way is inefficient and unhealthy for our fingers. Instead we can scroll one screenfull at a time, which severely reduces the amount of key presses involved.