search and replace
:%s///g
start of line
$
end of line
0 (zero)
ctrl-e/ctrl-y
shift file up/down one line
ctrl-u/ctrl-d
shift file up/down several lines
j/k
cursor down/up one line
h/l
cursor left/right one character
o
insert line after current
yy/dd
copy or delete lines
p
paste