Your Favorite Knots?

What are your favorite fly fishing knots? Tell which are your favorite for each kind of connection, like the following. Here are mine:

• Fly line to Leader -- Left Kreh's No-Slip Mono Loop
• Leader to Tippet -- Alberto Knot (But I usually use straight mono as leader)
• Tippet/Leader to Fly -- Trilene Knot

Let us know your favorite backing knot too if you'd like!

1. I prefer to use perfection loops on my leader to attach it to the loop on the fly line
2. Double surgeons knot
3. Trilene knot

• Fly line to Leader -- Perfection Loop
• Leader to Tippet -- Double Surgeon
• Tippet/Leader to Fly -- Left Kreh's No-Slip Mono Loop or Improved Clinch and others for other situations.
  
  This way to tie the clinch knot is awesome for droppers. One rubber leg or one hackle is always getting in there ruining the knot.
  
  https://www.youtube.com/watch?v=7H0lvKvsmtA

Let us know your favorite backing knot too if you'd like!- Definitely two big perfection loops large enough to pass the reel through. With the large loop to loop you can change fly lines on a reel in 15 minutes or less.

Fly line to leader - perfection loop to welded loop
Butt to tippet or mid section - blood knot
Tippet to fly - Rapala loop or Davy.