I have a file opened with vim, how do I keep the top 10 header lines at the top all the time while I scroll down the page?
ctrl-w s will split the screen horizontally, and
ctrl-w ctrl-w will switch your focus back and forth. You can widen the current viewport with
ctrl-w +, or make is smaller with (any guess?)
You can do vertical splits with
ctrl-w v, and you can split a split to make fairly complex sets of viweports inside the vim screen.
:q will close your current viewport.