It was directed by Robert Redford, won a couple of Oscars, the cinematography is awesome, the story is very poignant and touching, funny, but also very sad.  I like it because it's about three men, father and two sons, and of mother but the mother plays a lessor role.  There are other women in it too, but it' s very much a story about fishing, fly fishing in Montana.  I used to fish a lot when I was a boy.  
The relationship between the two brothers is, in some ways, similar to Jack and Ennis, strong brother-bond of feelings, but without sexual expression.  They're both very much non gay, non bi sexual men.  Anyway, it's a classic.  Hope you enjoy it.
Rayn