Learned a new connection the other week down in Hatteras. It is the improved blood knot. It doubles the strength of the braid at the knot. I was taught 5 wraps of the thin line and 3 with the leader. It makes a tapered knot, which helps it go smoothly through the guides. After a few tries, it is really simple to tie.
Not exactly the order I was taught it in, but results look the same.
Improved Blood Knot - Instructions