Lose Fewer Fish
That seemingly useless metal ring on the front of your fishing vest can help you test the strength of your leader tippet. Hook your fly or lure to it, then pull steadily on the leader about a foot above the hook. If the tippet is frayed or the leader knot is weak, it will break now instead of when you have a fish on. Recheck after unhooking every fish, and switch to a new tippet before the old one wears out.