The Eldredge knot is a complex knot and is produced by using the smaller end as the active end.
This knot has a little more bulk than the Four-in-Hand but should be pulled tight to give it a slender & polished look.
The Kelvin is an extension of the Simple knot. This knot produces a tidy knot slightly fuller and more angular than the Four-in-Hand knot.
The Balthus knot is a large tie knot that results in a finished tie that is very short. Get controversial with this artsy knot.
The most simple tie knot. Best with thick neckties or for tall guys who need a little extra length.
The Half Windsor knot is best used with neckties of a medium to light thickness. It is medium in size, nearly symmetrical and, when tied correctly, it produces a deep and substantial dimple
A symmetrical and solid triangular knot that works best with a spread collar.
If you only want to learn one knot, make it the Four-in-Hand knot.