Jump Between And Stage Git Hunks With Fugitive

Once you open vim-fugitive's git summary window, you'll see a listing of the tracked files with unstaged changes. Each of those files is made up of one or more hunks—a semi-contiguous chunk of changes in a Git diff.

You can jump forward and backward through these hunks with ]c and [c, respectively. If the inline diff view of a given file has not already been expanding, these navigational keybindings will auto-expand it.

With the cursor over the heading of a particular hunk, you can hit s (assuming you're looking at unstaged changes) to stage the entire hunk. Similarly, if the cursor is over the hunk heading of a change in the staged area, you can hit u to unstage that entire hunk.

For more details and a visual walkthrough, check out this screencast on staging commits within Vim.