If you are seeking a knot for tying your hooklength to the end of your fishing mainline, the overhand loop knot is absolutely perfect...
It's a really easy knot to tie and when tied correctly and used correctly, will provide a small loop that can be used to lock on another loop in another length of line - for example, your hooklength or ready-tied hooklengths.
The best thing about using this knot and method to attach two lengths of line together is that if you push the knots together after the loops have been joined together, you can actually thread the hooklength out from the mainline loop making it really quick and easy to switch to either a thinner or a thicker hooklength in seconds.
Here's how to tie the overhand loop knot...
Follow the same process with your hooklength and pass it through.
USING THE OVERHAND LOOP KNOT TO ATTACH A LOOP TO ANOTHER LOOP