INM is a special version of Normal mode, which gives us one bullet. We can fire off a single command, after which we'll be returned to Insert mode immediately.
<C-o>zz
: When the current line is right at the top or button of the window, you sometimes want to scroll the screen to see a bit more context. Thezz
command redraws the screen with the current line in the middle of the window, which allows us to read half a screen above and below the line we're working on.