Tippet knot: Triple Surgeons
Tippet to fly: clinch, improved clinch and Davy knot
Loop to loop: Perfection and Triple Surgeons
Dropper knot: Triple Surgeons
Fly line to butt section: nail knot
I have very few knot failures. I use Rio Fluroflex and P-Line Halo FC. For steelhead, I used 2 and 3X Rio Fluoroflex.