The four-in-hand knot is the easiest to learn among the four most commonly used tie knots (the four-in-hand knot, the half-Windsor knot, the Windsor knot and the Pratt knot). It is a small tie knot that suits shirts with a narrow collar opening and is suitable for most occasions. However, the four-in-hand knot is asymmetric, which does not look good on wide collar shirts.
The instructions for tying a four-in-hand knot are shown below. We assume that you are right-handed in the following instructions. The figures below are mirror images. They are what you will see if you stand in front of a mirror.
1. At the beginning, the wide end of the tie should be on your right side and the other end should be on your left side.
2. Cross the wide end over the other end. Now three regions are formed (Left, Right and Center).
3. Bring the wide end underneath the narrow end from Left to Right.
4. Bring the wide end over from Right to Left.
5. Bring the wide end under the knot to the Center region.
6. Bring the wide end down and pass the loop in front. Ensure that the knot is tightened.
7. Use one hand to pull the narrow end down gently and use the other hand to move the knot up until it reaches the center of the collar.
source: totieatie - How to Tie a tie - Four in hand Knot