The Grinner Knot (above) is one of the most widely used knots in carp fishing, its is probably one of the strongest knots that is available to us at the moment.
It looks relatively hard to tie but once you get the hang of it, it is very easy to tie and is probably one of the mostly used knots on this page.
The knot itself is very versatile and can be used for numerous applications eg.hooks, swivels and leads to name a few.
The amount of turns you give the line is up to you, but the normal application is either 5 or 6 turns. I have heard of people using up to 10 turns but i find if you put too many turns in then the line burns when tightening it up.
The picture shows the line being looped through the eye of the hook twice, but i only do this if I am long range fishing (just for a bit more security for those big chucks).