:set numberShow line numbers (:set nonumber to hide)
:set relativenumberShow relative line numbers
:set hlsearchHighlight search matches
:set incsearchShow search matches as you type
:set ignorecaseCase-insensitive search
:set smartcaseCase-sensitive if pattern has uppercase
:set wrapWrap lines visually
:set nowrapDisable line wrapping
:nohlsearchTemporarily remove search highlights
:!commandExecute shell command (e.g., :!ls)
:r !commandInsert output of shell command into file
:helpOpen Vim help (:help topic for specific)
Ctrl+gShow file name and position info
gaShow ASCII/Unicode value of character