关注
(8) ctrl + u上一页； ctrl+d下一页
(9) G: move all the way down
(10) gg: move all the way up
(11) o/O: insert a line after/before and then change to the edit mode
(12)
d+w: delete a word.
d+e: delete to the end of the current word
c+w/c+e: the same functionality as d+w/d+e, but change to the edit mode in the end
(13)
dd: delete the line
cc: delete the line and then change to the edit mode.
(14)
cap+H/M/L: change to the top/middle/end of the current page
