How to decide on Leader size and length? I'm getting the fly

Skate or Die: 360 Flashers – Salmon & Steelhead Journal

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Choosing the Right Tippet Size for Your Fly and How to Modify Tippet on Your Leader

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How to Determine Correct Leader Length

Fly fishing (U.S. National Park Service)

What Does The X Mean When Choosing Leaders + Tippet?– All Points Fly Shop + Outfitter

How to Choose Leader Size and Length When Fly Fishing Trout