Linux.com: Vim Tips: Folding Fun

“The problem with writing and editing on a computer, versus
having words on paper, is that it’s usually hard to compare text
from different sections of a document when they don’t fit on the
screen together. One way to do it is to use Vim’s viewports
feature. Another is to ‘fold’ the text. Using Vim’s folding
features, you can tuck away portions of a file’s text so that
they’re out of sight until you want to work with them again. Here’s
how.

“Vim’s folding commands begin with z–which, as the
Vim docs point out, sort of looks like a folded piece of paper. OK,
maybe not much, but at least the commands are consistent…”

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