Is there a way to center the line I'm editing in the screen? This is sometimes needed to see a bit more context above and below the current line.
How do I center the current line in the screen?
scrolling
The z. and zz commands will recenter the line the cursor is on.  z. also moves the cursor to the first non-whitespace character in the line, while zz keeps the cursor where it is.There are similar commands for the top (z<CR>/zt) and bottom (z-/zb) of the window.The versions of these commands that end in a letter keep the cursor column, while the ones ending in punctuation move the cursor.