Some easy-to-forget vim tricks.

CommandDescription
:set rnuset relative numbers
:set numberset line numbering
:e[dit]open
:Exploreopen dir
:Sexploreopen dir in hortizontal split (:sp)
:Vexploreopen dir in Vertical split (:vs)
:g/{pattern}/ddelete lines matching {pattern}
:g!/{pattern}/ddelete lines not matching {pattern}
:v/{pattern}/ddelete lines not matching {pattern}
:w !sudo tee %open currently edited file with sudo