To attach your lure to a nylon monofilament or fluorocarbon leader of less than 150lb breaking strain, the Rapala Knot is the best way to go.
This knot doesn't snug up tight to the lure, but creates a loop which gives the lure freedom to move as its designers intended.
For larger diameter mono, and all multi-strand wire line, you'll need to use a crimped connection.
For a single-strand wire leader, the Haywire Twist is your only option.
However tempting, what you should never do is to use a snap swivel to attach the lure as this may prevent the lure from operating as it was designed to.
Stage 1
First, tie an overhand knot and pass the tag end through the lure's attachment eye.
Stage 2
Then, wrap the tag end three times around the standing part of the line before tucking it back through the overhand knot as shown.
Stage 3
Next, pass the tag end back through the loop you've formed ...
Stage 4
... and finally pull the knot up tight.
Artwork by Andrew Simpson
If you like the idea of having the most popular sea fishing knots all together in one place for easy reference, this handy little pocket guide is just the thing.
It sets out in step-by-step instructions and nicely drawn sketches how to tie all the knots you'll ever be likely to need - 18 of them in all.
Being spiral bound it opens flat, leaving both hands free to tie the knot - and it's waterproof!
Connecting Hooks, Swivels and Lures to Single-Strand Wire Line
Forming a Stand-Off dropper Loop in Mono Line
Forming a Reinforced Loop in Mono Line
Connecting Mono Line Directly to Single-Strand Wire Line