This is the easiest way to tie a strong loop knot, the bowline, in fluorocarbon or mono leader. It allows the hook to move freely with no drag from the line.
This is a simple video on tying a Palomar knot. I feel it's the best way to tie a hook on your line.
A simple way to tie the Double Uni knot for tying braid to fluorocarbon. 4 turns of braid and 3 turns of fluorocarbon are all that is needed.