Question 193097
You  are  right  about  sum of  exterior  angles  =  360  always.
 a  rough  sketch  is  perhaps  best  way  to  explain  external  angles
draw  a  point,,,,and  just  a  quadrilateral  for  example
pick  one  vertex  of  quadrilateral,,,,  on  point  draw  exterior  angle  to  match.
go  to  next  vertex,,,,draw  that  exterior  angle  on  point sketch,,,(one  side  should  match  previous  angle)
go  to  next  vertex,,,   draw  that  ext  angle  on  point  drawing
if  you  progress  around  quadrilateral,,,and  mark  only  ext  angles  on   point  dwg,,
you  should  get  back  to  beginning,,
on  a  point  drawing  if  we  rotate  around  once  and  come  back  to  beginning,  we  go  360  degrees
the  number  of  sides  does  not  matter, nor  does  any  +  or  -  rotations,  because  we  always  go  around  once,  and  come  back  to  beginning.