+If there's one feature of Vimscript that will let you bend Vim to your will it's
+the ability to map keys. Mapping keys lets you tell Vim: "when I press this
+key, I want you to do this stuff instead of whatever you would normally do".
+We're going to start off by mapping keys in normal mode. We'll talk about how
+to map keys in insert and other modes in the next chapter.
+Type a few lines of text into a file, then run:
+Put your cursor somewhere in the text and press `\`. Notice how Vim deleted the
+character under the cursor, just like if you had pressed `x`.
+We already have a key for "delete that character under the cursor", so let's
+change that mapping to something slightly more useful. Run this command:
+Now put your cursor on a line somewhere and press `\` again. This time Vim
+deletes the entire line, because that's what `dd` does.
+You can use `<keyname>` to tell Vim about special keys that are hard to type.
+Try running this command:
+Put your cursor on a word in your text and press the space bar. Vim will
+visually select the word.
+You can also map modifier keys like Ctrl and Alt. Run this:
+Now pressing `Ctrl+d` on your keyboard will run `dd`.
+Remember in the first lesson where we talked about comments? Mapping keys is
+one of the places where Vim comments don't work. Try running this command:
+ :map <space> viw " Use space to select a word
+If you try pressing `<space>` now, something horrible will almost certainly
+When you press the space bar now, Vim thinks you want it to do what
+would do. Obviously, this isn't what we want.
+This mapping is even more interesting though, because if you look closely at its
+effect you might notice something strange. Take a few minutes to try to figure
+out what it is before you move on. Don't worry if you don't get it now, because
+we'll talk about it more later.
+Map the `-` key to "delete the current line, then paste it below the one we're
+on now". This will let you move lines downward in your file with one keystroke.
+Add that mapping command to your `~/.vimrc` file so you can use it any time
+Figure out how to map the `_` key to move the line up instead of down.
+Add that mapping to your `~/.vimrc` file too.
+Try to guess how you might remove a mapping and reset a key to its normal