Avengers: Infinity War (Anthony & Joe Russo) - 2018

There was a lot of fighting in this movie.  Mostly, the Marvel heroes were fighting against Josh Brolin because of his radical population-control plan.  There was also a lot of money spent on special effects.  And, Peter Dinklage forged a giant axe for Thor.  Can somebody please explain the ending to me?  [JAM 4/30/2018]