Scrolling

CTRL-E  	N  CTRL-E	window N lines downwards (default: 1)
CTRL-D  	N  CTRL-D	window N lines Downwards (default: 1/2 window)
CTRL-F  	N  CTRL-F	window N pages Forwards (downwards)
CTRL-Y  	N  CTRL-Y	window N lines upwards (default: 1)
CTRL-U  	N  CTRL-U	window N lines Upwards (default: 1/2 window)
CTRL-B  	N  CTRL-B	window N pages Backwards (upwards)
z<CR>  		   z<CR> or zt	redraw, current line at top of window
z.  		   z.	 or zz	redraw, current line at center of window
z-  		   z-	 or zb	redraw, current line at bottom of window