In theory, fly-fishing is a simple sport: Pick a body of water, choose a fly-fishing rod, select your “fly” (or bait), tie a secure knot, cast your line and, hopefully, land a fish on the other end.

An expert guide breaks down the best fishing rod and reel setups for every environment, from mountain streams to the surf.

There are certain fly fishing tips and tricks you pick up along the way that aren't flashy, but they make things easier, set ...