vim

shift+v: select lines
y: copy selected lines
d: delete selected lines
p: paste 

u: undo

insert (once): add text
insert (twice): replace

# find occurence of foo in all lines and replace by bar
:%s/foo/bar/g

# go to line
:lineNumber

# open different files in tabs
:tabe <filepath>
gt            # go to next tab
gT            # go to previous tab
{i}gt         # go to tab in position i